XenForo Version: 2.2.7
Add-on version: 2.2.15
When user opens a page with series, if series is marked as "Community" and they contains any community item, then this can cause server error log entry:
After looking into compiled template file, problem looks on line 251, where user_id is trying to be get from $communityContributor.User
Add-on version: 2.2.15
When user opens a page with series, if series is marked as "Community" and they contains any community item, then this can cause server error log entry:

After looking into compiled template file, problem looks on line 251, where user_id is trying to be get from $communityContributor.User