Autocomplete (Tags style) broken

Hey.

I've updated to version 7.x-1.1 and run into a problem with a field using "Autocomplete (Tags style)". The auto-complete callback returns always an empty data set.

I could narrow it down to the added line "$string = implode('/', $args);" (module line 993) in "entityreference_autocomplete_callback".

The problem is, that the autocomplete url always ends with a /null e.g. "http://domain.com/entityreference/autocomplete/tags/field/node/node_type...".

When I remove the line everything works normal.