Errors in the log - setAttribute, read property

Exhibit A

Uncaught TypeError: Cannot read property 'setAttribute' of null row: 174 col: 41 stack: TypeError: Cannot read property 'setAttribute' of null url: http://...

Exhibit B

Uncaught TypeError: Cannot read property 'setAttribute' of null row: 164 col: 41 stack: TypeError: Cannot read property 'setAttribute' of null url: http://...

Exhibit C

msg: Uncaught TypeError: Cannot read property 'scrollHeight' of null row: 11 col: 4466 stack: TypeError: Cannot read property 'scrollHeight' of null url: http://...

All these error registered with append: /api/v1/admin/log_client:client code=500
These errors show with a strange row 164, 173 specific row / col.
Could it be from the mysql incompatibility?

The sistem works fine, no issues encountered.
But these red errors ....
Ubuntu 14.4, MySQL (not PostgreSQL), one server, VPS.