diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c
index 02ffe58..ff5d38d 100644
--- a/openbsc/src/libmsc/gsm_04_08.c
+++ b/openbsc/src/libmsc/gsm_04_08.c
@@ -3005,6 +3005,10 @@
 			LOGP(DMNCC, LOGL_NOTICE, "TCH frame for trans without conn\n");
 			return 0;
 		}
+		if (!trans->conn->lchan) {
+			LOGP(DMNCC, LOGL_NOTICE, "TCH frame for trans without lchan\n");
+			return 0;
+		}
 		if (trans->conn->lchan->type != GSM_LCHAN_TCH_F
 		 && trans->conn->lchan->type != GSM_LCHAN_TCH_H) {
 			/* This should be LOGL_ERROR or NOTICE, but