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.  
			
			
			
				Do you have a backup of your database?
			
			
			
				Phil - I do have backups for the database
			
			
			
				Drop me a PM and I will get some credentials offyou to take a look.
			
			
			
				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.