Autocomplete term widget

First, thanks for such a useful module!

I'm trying to use a global filter for a taxonomy field, "topical cluster". The module is working just fine when topical cluster is set to a "Select List" widget, but generates a number of errors if I change the widget to "Autocomplete term widget". As soon as I change the widget back to Select List it works again.

The error on the view page is: Notice: Array to string conversion in global_filter_set_on_session() (line 234 of app-root/data/sites/all/modules/global_filter/global_filter.storage.inc).

While the global filter is still set and I go to edit the custom content type, I get several errors of these errors: Warning: Illegal offset type in taxonomy_field_widget_form() (line 1735 of app-root/data/downloads/drupal-7.43/modules/taxonomy/taxonomy.module).

I'm not sure if this issue is related to one that is closed or not:
https://www.drupal.org/node/2623246