removing primary ip address on ospf interface

hi. what happens to bird when you remove a primary ip address on an ospf interface? it seems that bird crashes. all i can find in log is nl_get_reply: Ignoring out of sequence netlink packet (7189e0 != 7189e1) and then some ospf and kernel route messages and then bird starting 6 minutes later when my colegue managed to log into the router and start it. anyone got a similar problem? is it a problem with bird or is it just stupid to remove a primare ip address on an ospf interface? thank mk