This is bug id 560332. The problem occurs when using multiple wildcard accounts. The problem was introduced in 6.0.5 & 6.2.0 but the fix is checked in and will be available when 6.0.6 & 6.2.1 are released.
We are hoping to release 6.2.1 by the end of this week. 6.0.6 is scheduled for end of July, after 5.6.9 is released.
Fortinet Technical Support