diff --git a/openbsc/src/libbsc/abis_om2000.c b/openbsc/src/libbsc/abis_om2000.c
index 139cc04..1183895 100644
--- a/openbsc/src/libbsc/abis_om2000.c
+++ b/openbsc/src/libbsc/abis_om2000.c
@@ -788,6 +788,9 @@
 	struct gsm_nm_state *nm_state = mo2nm_state(bts, mo);
 	struct nm_statechg_signal_data nsd;
 
+	if (!nm_state)
+		return;
+
 	nsd.bts = bts;
 	nsd.obj = mo2obj(bts, mo);
 	nsd.old_state = nm_state;