vocabperms.module on line 158

5.x-1.x-dev, User interface, bug report, normal, active

I get this message:
warning: key() [function.key]: Passed variable is not an array or object in /home/...../public_html/sites/all/modules/vocabperms/vocabperms.module on line 158.
I have 3 vocabularies for 1 content type. 2 roles can edit the node but only one can edit the vocabulary. The first vocabulary hides perfectly, but the second and third make use of taxonomy super-select to display and give above error message.
Is this a serious issue to fix? I need to use taxonomy super-select to display a country - town vocabulary.