Index: sys/net/if_epair.c
===================================================================
--- sys/net/if_epair.c
+++ sys/net/if_epair.c
@@ -609,8 +609,10 @@
 	struct epair_softc *sc;
 	
 	sc = ifp->if_softc;
-	KASSERT(sc != NULL, ("%s: ifp=%p, epair_softc gone? sc=%p\n",
-	    __func__, ifp, sc));
+
+	if (sc == NULL)
+		return;
+
 	/*
 	 * Remove this ifp from all backpointer lists. The interface will not
 	 * usable for flushing anyway nor should it have anything to flush