diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index cc1ae4d..f40de0b 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -709,7 +709,10 @@
 	}
 
 	/* copy the selected apn_str */
-	strcpy(out_apn_str, selected_apn_str);
+	if (selected_apn_str)
+		strcpy(out_apn_str, selected_apn_str);
+	else
+		out_apn_str[0] = '\0';
 
 	if (apn_ctx == NULL && selected_apn_str)
 		apn_ctx = sgsn_apn_ctx_match(selected_apn_str, mmctx->imsi);