I created a simple Rule that flags comment:node after a comment was edited. This works fine for registered users, but not for anonymous users. I get the following errors:

Notice: Trying to get property of non-object in flag_flag->flag() (regel 730 van /MYSITE/sites/all/modules/flag/includes/flag/flag_flag.inc).
Notice: Trying to get property of non-object in flag_flag->flag() (regel 739 van /MYSITE/sites/all/modules/flag/includes/flag/flag_flag.inc).

Probably this doesn't relate to the problem, but anonymous users don't have permission to flag nodes, so I skip the permission check in the Rule.

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Jeroen94 created an issue.