Groups Restrict Categories invalid taxonomy bug

Hey,
I’ve noticed that I’ve been having problems with groups restrict categories since enabling DEBUG_DISPLAY to test a plugin.
I thought it may have been the plugin I was testing however I noticed that after I disabled all plugins except Groups & Groups Restrict Categories, and changed my theme to 2015 then I would still get the error. The error went away when I disabled Groups Restrict Categories.

Th error appears on every single wordpress page (not posts or categories). These two lines are repeated.

Notice: Trying to get property of non-object in /home/technoto/public_html/wp-includes/category-template.php on line 1155
Warning: array_map(): Argument #2 should be an array in /home/technoto/public_html/wp-includes/category-template.php on line 1160

I did a bit of digging and it turns out that it is caused by user_can_read in class-groups-restrict-categories.php when it calls get_the_terms with an “invalid taxonomy” which confuses get_the_terms in category-template.php to process this object: O:8:"WP_Error":2:{s:6:"errors";a:1:{s:16:"invalid_taxonomy";a:1:{i:0;s:16:"Invalid taxonomy";}}s:10:"error_data";a:0:{}} where it is expecting an array of terms.

Could some please provide a fix so that I can continue using my site white relies on groups restrict categories? Thanks