Hi,
I pushed your modified plugin to my production website that I just updated to WPLMS 3.7 and got new errors showing, but I think they are related to the changes you made to the plugin.
I disabled all caching and minifiying but issue still occurs.
Screenshot 1 (if I don't call course taxonomy on the grid, error is gone).
I can't give access to production website since I have many user info there. Do these errors makes sense to you? Can you update things without access? Thanks