diff --git a/src/fsm.c b/src/fsm.c
index ae2fdc2..0370f65 100644
--- a/src/fsm.c
+++ b/src/fsm.c
@@ -541,7 +541,9 @@
 			    osmo_fsm_event_name(fsm, event));
 		return -1;
 	}
-	fs->action(fi, event, data);
+
+	if (fs->action)
+		fs->action(fi, event, data);
 
 	return 0;
 }