One channel unusable after using GitLab slack command

Last night we updated to GitLab 8.17 and started trying the Slack commands this morning. /gitlab issues search just worked fine and listed some issues. Then we tried /gitlab issue show <number> and nothing got displayed. We thought that the command was broken and left it as is.

A couple of hours later we were wondering why that channel did not show any new messages in general and after a while we found out that thius channel throws exceptions in the console of the browser:

Uncaught TypeError: e.replace is not a function
Please report this to https://github.com/chjj/marked.
    at t.lex (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:53:848)
    at Function.t.lex (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:53:801)
    at d (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:52:30809)
    at Object.i [as a] (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:38:3723)
    at Object.a [as f] (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:10:9957)
    at https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:30:8640
    at Array.forEach (native)
    at t.value (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:30:8083)
    at t.value (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:30:10256)
    at u._renderValidatedComponentWithoutOwnerOrContext (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:22556)
    at u._renderValidatedComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:22683)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18502)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18662)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18662)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18662)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18662)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18662)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at h.mountChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16196)
    at h._createInitialChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31095)
    at h.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:29247)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at u.performInitialMount (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:18662)
    at u.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:17548)
    at Object.mountComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23553)
    at Object.updateChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:15147)
    at h._reconcilerUpdateChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:15959)
    at h._updateChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16724)
    at h.updateChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:16622)
    at h._updateDOMChildren (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:1446)
    at h.updateComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31693)
    at h.receiveComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:31246)
    at Object.receiveComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:23947)
    at u._updateRenderedComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:22027)
    at u._performComponentUpdate (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:21784)
    at updateComponent (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:21062)
    at u.performUpdateIfNecessary (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:56:20389)
    at Object.performUpdateIfNecessary (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:24129)
    at s (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:9:20220)
    at a.perform (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:13:6143)
    at i.perform (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:13:6143)
    at i.perform (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:9:21307)
    at Object.C [as flushBatchedUpdates] (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:9:21476)
    at a.closeAll (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:13:6737)
    at a.perform (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:13:6226)
    at Object.batchedUpdates (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:57:11662)
    at Object.l [as enqueueUpdate] (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:9:20502)
    at a (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:15:17502)
    at Object.enqueueSetState (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:15:18518)
    at t.a.setState (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:15:28572)
    at t.value (https://mattermost.example.com/static/12.1e0c40e2cab9696388ce.js:1:6423)
    at t.a.emit (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:8:22239)
    at t.value (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:1953)
    at Object.ID_8 (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:11:11983)
    at e._invokeCallback (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:47:30926)
    at e.dispatch (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:47:30728)
    at e.handleServerAction (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:7:2990)
    at https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:10:8012
    at a.value (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:27:19269)
    at p.callback (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:24:16183)
    at p.<anonymous> (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:24:13128)
    at p.a.emit (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:47:12445)
    at XMLHttpRequest.n.onreadystatechange (https://mattermost.example.com/static/main.40a3b202d702380c27ea.js:24:17061)

Now, I don't know what GitLab did post that results in that mess but even worse, how can I restore my channel such that it displays the other stuff again?

Can I grab the broken messages from the database and maybe delete them there manually? Please help. We're using that for DevOps and we're missing status messages.