Postcard causing error to display on Event page

I am getting the following errors 3 times each on my Event calendar view:

# warning: array_keys() [function.array-keys]: The first argument should be an array in /home/lolajo5/public_html/sites/all/modules/postcard/postcard.module on line 424.

# warning: Invalid argument supplied for foreach() in /home/lolajo5/public_html/sites/all/modules/postcard/postcard.module on line 425.

I have no idea why. The lines in the module have to do with adding the postcard link to gallery images (part of the postcard_link($type) function), specifically with the Taxonomy. Just to be clear - on this site, the Image Gallery taxonomy is only applied to images and the events have NO taxonomy at all.

I have tried creating a taxonomy and assigning events their own terms, but this has no effect. Also, it should be noted that the errors only show up on the calendar view pages, and not the individual event nodes.

Ron