@todo: Add a summary and steps to reproduce!
For now, please see comment #22 for instructions for testing the patch (and as such, an implied explanation of how to encounter the problem).
Review the patch on a site without user reference, to verify there aren't any side effects.
Notice: Undefined index: uid in nodeaccess_delete_user_reference() (line 1234 of /var/www/drupal/sites/all/modules/nodeaccess/nodeaccess.module).
Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 173 of /var/www/drupal/includes/entity.inc).
Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 350 of /var/www/drupal/includes/entity.inc).
Notice: Trying to get property of non-object in nodeaccess_delete_user_reference() (line 1235 of /var/www/drupal/sites/all/modules/nodeaccess/nodeaccess.module).
Notice: Undefined index: uid in nodeaccess_insert_user_reference() (line 1193 of /var/www/drupal/sites/all/modules/nodeaccess/nodeaccess.module).
Notice: Undefined index: uid in nodeaccess_insert_user_reference() (line 1211 of /var/www/drupal/sites/all/modules/nodeaccess/nodeaccess.module).
when i try to save a content type with a user reference field this are the error displayed. need help.
Needs review
1.0
Code
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
User reference wasn't working in latest version
This historic issue is for the Drupal 7 version and the patch needs to be re-rolled against current dev...
For the 2.x version, I believe you should open a new issue.