Hi,
I have seen this issue here too. Its a test system, and there are only a handful of users registered. The Websocket-Port was not available when it happend (proxy).
Sessions (LDAP/Mobile/SSO): 30 days
Session Cache: 30 Min
Auth: email Registration, email login and username login all set to true, gitlab off
Only one user was affected.
Feel free to ask for further infos
Andreas
releavant timestamp around 1544002699.9016292
Log:
{"level":"info","ts":1543611462.540184,"caller":"app/app.go:204","msg":"Server is initializing..."}
{"level":"info","ts":1543611462.5437896,"caller":"sqlstore/supplier.go:209","msg":"Pinging SQL master database"}
{"level":"error","ts":1543611462.5451984,"caller":"sqlstore/supplier.go:221","msg":"Failed to ping DB retrying in 10 seconds err=dial tcp 172.21.0.2:5432: connect: connection refused"}
{"level":"info","ts":1543611472.5453799,"caller":"sqlstore/supplier.go:209","msg":"Pinging SQL master database"}
{"level":"info","ts":1543611472.5532699,"caller":"sqlstore/channel_store_experimental.go:47","msg":"Enabling experimental public channels materialization"}
{"level":"info","ts":1543611472.786928,"caller":"sqlstore/upgrade.go:101","msg":"The database schema has been set to version 5.5.0"}
{"level":"error","ts":1543611473.1770208,"caller":"commands/server.go:79","msg":"SiteURL must be set. Some features will operate incorrectly if the SiteURL is not set. See documentation for details: http://about.mattermost.com/default-site-url"}
{"level":"info","ts":1543611473.17714,"caller":"commands/server.go:82","msg":"Current version is 5.5.0 (5.5.0/Thu Nov 15 18:39:02 UTC 2018/826252252404c13bf564a8c4fd51616fc2cc4df9/8eb31159c091f8a1e75c99ae6f4e47010dbf3731)"}
{"level":"info","ts":1543611473.177166,"caller":"commands/server.go:83","msg":"Enterprise Enabled: true"}
{"level":"info","ts":1543611473.177184,"caller":"commands/server.go:84","msg":"Current working directory is /mattermost"}
{"level":"info","ts":1543611473.1772916,"caller":"commands/server.go:85","msg":"Loaded config file from /mattermost/config/config.json"}
{"level":"info","ts":1543611473.1776323,"caller":"filesstore/localstore.go:33","msg":"Able to write files to local storage."}
{"level":"info","ts":1543611473.1797395,"caller":"app/license.go:44","msg":"License key from https://mattermost.com required to unlock enterprise features."}
{"level":"info","ts":1543611473.1805081,"caller":"app/app.go:545","msg":"Migrating roles to database."}
{"level":"info","ts":1543611473.2255137,"caller":"sqlstore/post_store.go:1297","msg":"Post.Message supports at most 16383 characters (65535 bytes)"}
{"level":"info","ts":1543611473.2531612,"caller":"app/app.go:621","msg":"Migrating emojis config to database."}
{"level":"info","ts":1543611473.2611668,"caller":"app/plugin.go:100","msg":"Starting up plugins"}
{"level":"error","ts":1543611473.4490578,"caller":"app/plugin.go:129","msg":"Failed to unpack prepackaged plugin","error":"installPlugin: Unable to move plugin from temporary directory to final destination. Another plugin may be using the same directory name., mkdir /mattermost/plugins/jira: permission denied","path":"/mattermost/prepackaged_plugins/mattermost-jira-plugin-linux-amd64.tar.gz"}
{"level":"error","ts":1543611473.63367,"caller":"app/plugin.go:129","msg":"Failed to unpack prepackaged plugin","error":"installPlugin: Unable to move plugin from temporary directory to final destination. Another plugin may be using the same directory name., mkdir /mattermost/plugins/zoom: permission denied","path":"/mattermost/prepackaged_plugins/mattermost-zoom-plugin-linux-amd64.tar.gz"}
{"level":"info","ts":1543611473.6340206,"caller":"app/server.go:88","msg":"Starting Server..."}
{"level":"info","ts":1543611473.6340418,"caller":"app/server.go:114","msg":"RateLimiter is enabled"}
{"level":"info","ts":1543611473.6342072,"caller":"app/server.go:148","msg":"Server is listening on [::]:8000"}
{"level":"info","ts":1543611473.641773,"caller":"app/web_hub.go:75","msg":"Starting 28 websocket hubs"}
{"level":"info","ts":1543611473.6884718,"caller":"jobs/workers.go:63","msg":"Starting workers"}
{"level":"info","ts":1543611473.688623,"caller":"jobs/schedulers.go:68","msg":"Starting schedulers."}
{"level":"info","ts":1543611484.3701124,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.5964255,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.7460868,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.778702,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.7790365,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.79785,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.798956,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.7989955,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611484.7992055,"caller":"web/handlers.go:95","msg":"Invalid session","error":"GetSession: Invalid session token=ihgq3xycitdduffxmhdne5dyho, err=<no value>, "}
{"level":"info","ts":1543611545.472673,"caller":"migrations/worker.go:109","msg":"Worker: Job is complete","worker":"Migrations","job_id":"qb1w17j1wtgsfe3pwkrf1rgiue"}
{"level":"error","ts":1543613441.3099,"caller":"web/context.go:60","msg":"Login failed because email address has not been verified","path":"/api/v4/users/login","request_id":"ro84q7bamifixctj5j8wkeu61y","ip_addr":"93.239.168.1","user_id":"","method":"POST","err_where":"Login","http_code":401,"err_details":"user_id=sqz7cgmj9tncjr86pb1eu7c6ga"}
{"level":"error","ts":1543649706.8724155,"caller":"web/context.go:60","msg":"Login failed because email address has not been verified","path":"/api/v4/users/login","request_id":"ubshk5ssz78o5b9ghyfo1dmw1w","ip_addr":"93.239.168.1","user_id":"","method":"POST","err_where":"Login","http_code":401,"err_details":"user_id=sqz7cgmj9tncjr86pb1eu7c6ga"}
{"level":"error","ts":1543655067.61145,"caller":"web/context.go:60","msg":"Connection unsuccessful: SendMail: Error setting \"To Address\", 454 4.7.1 <andreas.schrell@set.de>: Relay access denied","path":"/api/v4/email/test","request_id":"tz1tpkoh5iy3tgfg8od6wncduo","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":500,"err_details":""}
{"level":"error","ts":1543655093.7459931,"caller":"web/context.go:60","msg":"The SMTP server, port, or username has changed. Please re-enter the SMTP password to test connection.","path":"/api/v4/email/test","request_id":"a35qgmgxdpdutpn8icqzezmz9a","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":400,"err_details":""}
{"level":"error","ts":1543655118.3421202,"caller":"web/context.go:60","msg":"Connection unsuccessful: SendMail: Error setting \"To Address\", 454 4.7.1 <andreas.schrell@set.de>: Relay access denied","path":"/api/v4/email/test","request_id":"jicku4e5cig1xgozrnpdybwjya","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":500,"err_details":""}
{"level":"error","ts":1543655184.0301938,"caller":"web/context.go:60","msg":"The SMTP server, port, or username has changed. Please re-enter the SMTP password to test connection.","path":"/api/v4/email/test","request_id":"bucfotackiredjxag6e38yknba","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":400,"err_details":""}
{"level":"info","ts":1543655245.0208557,"caller":"app/admin.go:141","msg":"Purging all caches"}
{"level":"error","ts":1543655245.021867,"caller":"app/app.go:724","msg":"Elasticsearch.start: Elasticsearch is already stopped, "}
{"level":"info","ts":1543655245.023267,"caller":"app/license.go:44","msg":"License key from https://mattermost.com required to unlock enterprise features."}
{"level":"error","ts":1543655295.884512,"caller":"mailservice/mail.go:134","msg":"Failed to open a connection to SMTP server EOF"}
{"level":"error","ts":1543655295.8850725,"caller":"web/context.go:60","msg":"Connection unsuccessful: SendMail: Failed to open TLS connection, EOF","path":"/api/v4/email/test","request_id":"xprtfpyuuf8nxbwsnwfhx883ho","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":500,"err_details":""}
{"level":"error","ts":1543657055.1799138,"caller":"web/context.go:60","msg":"Connection unsuccessful: SendMail: Failed to open TLS connection, tls: first record does not look like a TLS handshake","path":"/api/v4/email/test","request_id":"wtqow73pqire9ytdnkpaso89uc","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":500,"err_details":""}
{"level":"error","ts":1543657066.4635332,"caller":"web/context.go:60","msg":"The SMTP server, port, or username has changed. Please re-enter the SMTP password to test connection.","path":"/api/v4/email/test","request_id":"mzqp365agfrg8nnstbj1i76fie","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":400,"err_details":""}
{"level":"error","ts":1543657079.9372268,"caller":"web/context.go:60","msg":"The SMTP server, port, or username has changed. Please re-enter the SMTP password to test connection.","path":"/api/v4/email/test","request_id":"c4kcfks9ip81pfg1n5jp11fypa","ip_addr":"93.239.168.1","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"POST","err_where":"testEmail","http_code":400,"err_details":""}
{"level":"warn","ts":1543658922.1430693,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=5wdyayzgofg9txydtrdde4sf7huser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"error","ts":1543668097.884317,"caller":"app/plugin_requests.go:33","msg":"Access to route for non-existent plugin","missing_plugin_id":"weathermap","error":"plugin not found: weathermap"}
{"level":"error","ts":1543690284.6304362,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"x74mo74ztjdadqk5a5q9ng81dc","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"invalid character '\\\\' looking for beginning of object key string"}
{"level":"error","ts":1543690399.0600736,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"g6wa3xwjn7g3fk19ias4173nqh","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"invalid character '\\\\' looking for beginning of object key string"}
{"level":"error","ts":1543690497.752325,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"itx8o5h91idfdyyxpyxipp64gr","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"invalid character ':' in string escape code"}
{"level":"error","ts":1543690509.656307,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"k9ktkgcc9jdyie9aacsxo7o1ya","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"invalid character '\\\\' looking for beginning of object key string"}
{"level":"error","ts":1543690619.5234547,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543691931.3684554,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"4g8b3w9ytp8qimu3ghttekmnhe","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"EOF"}
{"level":"error","ts":1543694951.8647408,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543695409.7174847,"caller":"app/plugin.go:86","msg":"failed to notify plugin status changed","error":"GetPluginStatuses: Plugins have been disabled. Please check your logs for details., "}
{"level":"info","ts":1543695409.7175927,"caller":"app/plugin.go:156","msg":"Shutting down plugins"}
{"level":"info","ts":1543695418.3192344,"caller":"app/plugin.go:100","msg":"Starting up plugins"}
{"level":"error","ts":1543695418.514827,"caller":"app/plugin.go:129","msg":"Failed to unpack prepackaged plugin","error":"installPlugin: Unable to move plugin from temporary directory to final destination. Another plugin may be using the same directory name., mkdir /mattermost/plugins/jira: permission denied","path":"/mattermost/prepackaged_plugins/mattermost-jira-plugin-linux-amd64.tar.gz"}
{"level":"error","ts":1543695418.7114947,"caller":"app/plugin.go:129","msg":"Failed to unpack prepackaged plugin","error":"installPlugin: Unable to move plugin from temporary directory to final destination. Another plugin may be using the same directory name., mkdir /mattermost/plugins/zoom: permission denied","path":"/mattermost/prepackaged_plugins/mattermost-zoom-plugin-linux-amd64.tar.gz"}
{"level":"error","ts":1543696956.2283878,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543697199.5166519,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"x5dnkpuz738d5jxuiyn7761azc","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"EOF"}
{"level":"error","ts":1543697510.7627432,"caller":"web/context.go:60","msg":"Unable to parse incoming data","path":"/hooks/wbkd7nscopruiq6qcxdu6hw9eo","request_id":"yz6rr9wogirxmjqarxho8xzrpa","ip_addr":"193.31.27.184","user_id":"","method":"POST","err_where":"IncomingWebhookRequestFromJson","http_code":400,"err_details":"EOF"}
{"level":"error","ts":1543701844.8538427,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543706525.192326,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543748882.149343,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543825004.928532,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543842121.0643983,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543842225.4815443,"caller":"web/context.go:60","msg":"Unable to find an existing account matching your credentials. This team may require an invite from the team owner to join.","path":"/api/v4/users/login","request_id":"gfn7rejftibi5mmhf981o6kmea","ip_addr":"unknown","user_id":"","method":"POST","err_where":"GetUserForLogin","http_code":400,"err_details":""}
{"level":"error","ts":1543843864.6281734,"caller":"app/notification_push.go:276","msg":"Device push reported as error for UserId=sqz7cgmj9tncjr86pb1eu7c6ga SessionId=tpdj8zeofpgwtqtg41kfk7htae message=Post http://push-test.mattermost.com/api/v1/send_push: dial tcp: i/o timeout","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga"}
{"level":"error","ts":1543845898.1459417,"caller":"app/post.go:806","msg":"GetOpenGraphMetadata request failed for url=http://www.set.de with err=Get https://www.set.de/: x509: certificate signed by unknown authority"}
{"level":"error","ts":1543907065.5255935,"caller":"app/plugin_requests.go:33","msg":"Access to route for non-existent plugin","missing_plugin_id":"weathermap","error":"plugin not found: weathermap"}
{"level":"error","ts":1543917084.0131054,"caller":"app/plugin_requests.go:33","msg":"Access to route for non-existent plugin","missing_plugin_id":"weathermap","error":"plugin not found: weathermap"}
{"level":"error","ts":1543949229.2549407,"caller":"app/plugin_requests.go:33","msg":"Access to route for non-existent plugin","missing_plugin_id":"weathermap","error":"plugin not found: weathermap"}
{"level":"error","ts":1543969128.9502053,"caller":"app/plugin_requests.go:33","msg":"Access to route for non-existent plugin","missing_plugin_id":"weathermap","error":"plugin not found: weathermap"}
{"level":"warn","ts":1544002699.9016292,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544002729.2570977,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544002735.6797197,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544002735.7217083,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544002735.7465432,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544009725.975564,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544009739.1028051,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"error","ts":1544009740.1382554,"caller":"web/context.go:60","msg":"Invalid or missing channel_id parameter in request URL","path":"/api/v4/channels/undefined/posts","request_id":"wuidztdsa7ng5fumnmgc43gfiy","ip_addr":"unknown","user_id":"sqz7cgmj9tncjr86pb1eu7c6ga","method":"GET","err_where":"Context","http_code":400,"err_details":""}
{"level":"warn","ts":1544009740.4790547,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544012048.80506,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544012194.5471137,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544012200.1784813,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544012202.16077,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}
{"level":"warn","ts":1544012286.7585442,"caller":"app/channel.go:1578","msg":"Failed to get membership SqlChannelStore.GetMember: No channel member found for that user ID and channel ID, channel_id=neq5a3ok97n5uexwt6yogdr76auser_id=sqz7cgmj9tncjr86pb1eu7c6ga,sql: no rows in result set"}