Getting 'invalid argument' error on creation of node

Hello, I'm getting the following message after saving a new node:

Warning: Invalid argument supplied for foreach() in nodeaccess_nodereference_node_access_records() (line 423 of /sites/all/modules/nodeaccess_nodereference/nodeaccess_nodereference.module).

Perhaps also noteworthy; I'm using the 7.x-2.x-dev version of References (June 24). Thanks!