diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 3d74647..8de3bf7 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -2554,7 +2554,8 @@
 				       struct gprs_llc_llme *llme)
 {
 	int rc;
-	gprs_llgmm_reset_oldmsg(msg, GPRS_SAPI_GMM, llme);
+	if (llme)
+		gprs_llgmm_reset_oldmsg(msg, GPRS_SAPI_GMM, llme);
 
 	rc = gsm48_tx_gmm_detach_req_oldmsg(
 		msg, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED);