I am facing this assertion error in every list which is included a column type of managed metadata.
Even if I create a new custom list and add one metadata type column, this error is popping up when I click on quick edit.
Can anyone give a clue where I can start to fix this error?
The issue is resolved.
This issue occurred because the debugging mode was enabled in the SharePoint web.config file for that web application.
I disabled the debug mode and reset the IIS AND the error is gone. :)