diff --git a/src/iu_client.c b/src/iu_client.c
index b5f35574..8da9a439 100644
--- a/src/iu_client.c
+++ b/src/iu_client.c
@@ -796,6 +796,9 @@ static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu)
 		LOGPIU(LOGL_DEBUG, "N-DISCONNECT.ind(%u)\n",
 		       prim->u.disconnect.conn_id);
 		ue = ue_conn_ctx_find(prim->u.disconnect.conn_id);
+		if (!ue)
+			break;
+
 		rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg));
 		break;
 	case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
@@ -804,6 +807,9 @@ static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu)
 		       osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg)));
 		/* resolve UE context */
 		ue = ue_conn_ctx_find(prim->u.data.conn_id);
+		if (!ue)
+			break;
+
 		rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg));
 		break;
 	case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):