Coppermine critical error: The group table does not contain the Anonymous group

[Chickenman]

Updating Coppermine to cpg1.5.48    Used old config file and moved over Albums into new folder - ran upgrade.php and was presented with the critical error. 
No other instances of coppermine (I have five total photo albums online) had this issue when I ran the installer - just this last update.

Any ideas on how to resolve this issue - I have reloaded and repeated the process with the same result. 

[phill104]

Do you have a backup of your database?

[Chickenman]

Phil - I do have backups for the database

[phill104]

Drop me a PM and I will get some credentials offyou to take a look.

[phill104]

Chickenman sent me a copy of his database and indeed, the anonymous row was missing from the usergroups table. I can only speculate why it was missing. I created a sql file to correct this and he has now upgraded his site.