Got this error today (it is rare to occur, but reporting just in case)
Code:
Exception reported: Invalid database Handle 0 (error: 4)
Blaming: charms.smx
Call stack trace:
[0] Database.Format
[1] Line 1110, charms.sp::SavePreferences
[2] Line 1043, charms.sp::OnClientDisconnect
Probably just a null handle check may fix it.