diff --git a/openbsc/src/gprs/gb_proxy.c b/openbsc/src/gprs/gb_proxy.c
index eb1a699..cbf2e90 100644
--- a/openbsc/src/gprs/gb_proxy.c
+++ b/openbsc/src/gprs/gb_proxy.c
@@ -1327,10 +1327,10 @@
 		return 0;
 
 	if (ghp->sapi != GPRS_SAPI_GMM)
-		return 0;
+		return 1;
 
 	if (ghp->cmd != GPRS_LLC_UI)
-		return 0;
+		return 1;
 
 	if (ghp->is_encrypted) {
 		parse_ctx->need_decryption = 1;
@@ -1354,7 +1354,7 @@
 	int have_patched = 0;
 	int fcs;
 
-	if (!allow_message_patching(peer, parse_ctx->g48_hdr->msg_type))
+	if (parse_ctx->g48_hdr && !allow_message_patching(peer, parse_ctx->g48_hdr->msg_type))
 		return have_patched;
 
 	if (parse_ctx->raid_enc) {