I encountered an error which was due to a corrupted entry in the 'users' table of the database. The issue arose when I transferred data between environments: MySQL failed to create the anonymous user with UID=0, instead assigning the next available UID. This newly assigned UID had no corresponding entry in the 'users_data' table, causing disruptions in views loading content associated with the anonymous user.
Though the above patch helped identify the root cause, it wasn't a permanent fix. To resolve the problem, I manually set the UID for the anonymous user to 0 in the database, eliminating the need for the patch.
I used Navicat MySQL for data transfer, but I'm uncertain if that's where the UID discrepancy began, or if it might be related to some default setting within the SQL database that prevents assignment of a UID of 0.