Hello. We have been adding artists/albums/songs in my music collection component regularly over the last few weeks, without issue. However, a couple of days ago, we started noticing the following error:

Inside the "Related Artists" box under the Add New Artist option :

in_array() expects parameter 2 to be array, null given in ...../administrator/components/com_muscol/views/artist/tmpl/form.php on line 63

In the "Types" box under the Add New Album option:

in_array() expects parameter 2 to be array, null given in ...../administrator/components/com_muscol/views/album/tmpl/form.php on line 151

In the "Tabs" box under the Add New Album option:

in_array() expects parameter 2 to be array, null given in ...../administrator/components/com_muscol/views/album/tmpl/form.php on line 163

The files referenced in the error haven't been modified. I thought maybe one of the files we had uploaded might have caused a problem, so I checked file names and fixed a few that weren't standard (had quotes in them), then I cleared my joomla site's cache and my browser's cache as well. Still, these errors appear. Does anyone know what could be causing this problem?

Thank You