There is a slight error in my database setup.
I have the same session_prefix in 2 different forum which gives some strange user behaviors.
I have 2 forum in 1 database on 1 domain:

Forum1:
database-table-prefix: xf1_
settings: session_prefix: mlf2_

Forum2:
database-table-prefix: mlf2_
settings: session_prefix: mlf2_

I changed the Forum1 session_prefix to: xf1_ but then I could not log in as admin.
What is the safest way to solve this problem?
Does the session_prefix have to be the same as the database-table-prefix?

/Tommy