diff --git a/src/gprs/gprs_gmm.c b/src/gprs/gprs_gmm.c
index 147e001..8441f6b 100644
--- a/src/gprs/gprs_gmm.c
+++ b/src/gprs/gprs_gmm.c
@@ -1372,6 +1372,10 @@
 				ctx = sgsn_mm_ctx_alloc_iu(msg->dst);
 			else
 				ctx = sgsn_mm_ctx_alloc_gb(msgb_tlli(msg), &ra_id);
+			if (!ctx) {
+				reject_cause = GMM_CAUSE_NET_FAIL;
+				goto rejected;
+			}
 			ctx->p_tmsi = tmsi;
 		}
 		if (ctx->ran_type == MM_CTX_T_GERAN_Gb) {