Incorrect integer value:

DOException: SQLSTATE[HY000]: General error: 1366 Incorrect integer value: '' for column 'rtid' at row 1: REPLACE INTO {user_relationship_limits} SET rtid = :rtid, rid = :rid, role_limit = :rlimit; Array ( [:rtid] => [:rid] => 4 [:rlimit] => 1 ) in user_relationship_limits_submit() (line 254... etc etc...

Couldn't duplicate this. At the time of error I was renaming a user relationship...