[PHP 8.1] Fatal error:Uncaught TypeError:Unsupported operand types: string + int

[Grimlok]

Been stumped with this problem the past couple of days. I'm on CPG 1.6.20, bridged with a MyBB forum. I've been getting this message sporadically:

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Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /home/XXXXX/public_html/gallery/bridge/mybb.inc.php:170 Stack trace: #0 /home/XXXXX/public_html/gallery/bridge/udb_base.inc.php(170): cpg_udb->get_groups(Array) #1 /home/XXXXX/public_html/gallery/bridge/udb_base.inc.php(89): core_udb->load_user_data(Array) #2 /home/XXXXX/public_html/gallery/include/init.inc.php(252): core_udb->authenticate() #3 /home/XXXXX/public_html/gallery/index.php(22): require('/home/XXXXX/...') #4 {main} thrown in /home/XXXXX/public_html/gallery/bridge/mybb.inc.php on line 170

1. How do I update mybb.inc.php so that the string + int operation in line 170 proceeds successfully? As far as I can tell this is now disallowed in PHP 8.1.
2. I only get this message from time to time; otherwise my gallery works fine. When I do get the error, I'm able to resolve it by logging out and logging back in. That's weird to me - since I'm running a bridged gallery, shouldn't logging out and back in trigger the unsupported operation in the bridge file everytime I do it? Yet it works.

[Joe Carver]

Do you see any warnings if you turn on Debug / Notices that might show a hint of potential trouble?

I don't use bridging, but could take a look at the file and anything more known would help.

[Grimlok]

Turning on debug mode with notices, the only warnings that pop up are related to /include/functions.inc.php.

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/include/functions.inc.php
Warning line 3613: Trying to access array offset on value of type null
Warning line 3615: Trying to access array offset on value of type null
Warning line 3634: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3613: Trying to access array offset on value of type null
Warning line 3615: Trying to access array offset on value of type null
Warning line 3634: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3613: Trying to access array offset on value of type null
Warning line 3615: Trying to access array offset on value of type null
Warning line 3634: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3649: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3659: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3679: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null
Warning line 3688: Trying to access array offset on value of type null

I don't use bridging, but could take a look at the file and anything more known would help.

Thank you for the offer. I use the standard mybb.inc.php bridge file, and have the following site structure:

domain.com/forums
domain.com/gallery

The problem started appearing after I updated to PHP 8.1 - I was on PHP 7.4 before. And it's triggered when Coppermine attempts to retrieve the groups which the current user is a part of - in the function in question, an integer (100) is added to a string.

Let me know if you can think of anything else.