I have an issue with the block manager for the sidebar:

Every time i drag & drop a block this message appears.

I ve already tried to install a new theme but the problem stil occures.

 

 

Is this happening with all your blocks or only a specific?
Do you see any errors in the browsers JS console?

This happens every time and with every block.

This is the console:

 

But I don't know how to fix this 500 error 😕

 

 

I have created a ticket so that we can take a look at this.