Strict warning: Creating default object from empty value in _entity_defaults_rebuild() (line 772 of C:\Users\salomos\Sites\tgs-d

I notice this error on many different modules when I searched through Drupal.org. But, unfortunately, I did not come across a patch to fix the Entity module for this error. The best I found was a patch that would eventually be backported to Drupal 7 from 8 core. I can apply a patch but am not familiar enough with Drupal to go into the code and fix this myself. But, if someone can tell me how to fix this then I would be very grateful! And, could someone explain to me exactly why I see this particular error so much? I didn't fully understand the reason and would like to know how I can fix this if I come across it again in another module. (This isn't the only module I have received this error on but was able to find patches for the rest of them.)