Internal Server Error and spinner

[Qinn]

I just upgraded from 1.04 to 1.1.0, also I upgraded the plugin manager. After this I got an "Internal server error" in roundcube, yet everything worked fine.

Second I noticed that when I went to the calendar (the only plugin apart from legacy browser I have enabled) the spinner with "loading" keeps on turning. So I thought these two might be related, as I only use the calendar plugin I disabled it and for now the internal server error is gone. Can anyone shed so light onto this?

[Qinn]

It seems to be related to the calender plugin, after I disabled it this error is gone.

[Qinn]

After the latest calendar plugin install 19.0.43 -> 19.0.65 this error is gone