I have upgraded from Znuny 6.4.3 to 6.4.5 to 6.5.3 LTS.
I proceeded as written in the documentation.
For some tickets, not all, the customer information is not displayed.
It takes forever to load.
We have noticed that this error occurs with merged tickets.
We can no longer ineract with the item overview.
Also all entries are no longer displayed

I have the following error message in the browser.

Unfortunately no solution I found on the internet worked.
I have no experience with Znuny.
What went wrong?
How can I solve the problem?
Greetings Fgwork