oops, forgot one thing

src/map/vending.c

@@ -347,6 +347,8 @@ bool vending_openvending(struct map_session_data* sd, const char* message, const
 
 		//player just moved item to cart and we don't have the correct cart ID yet
 		if (sd->status.cart[sd->vending[i].index].id == 0) {
+			struct item_data *idb = itemdb_search(sd->status.cart[index].nameid);
+			char msg[256];
 			snprintf(msg, 256, "Item %s is not yet saved. Please re-log in order to correctly save your vending.", idb->jname);
 			clif_displaymessage(sd->fd, msg);
 			clif_skill_fail(sd, MC_VENDING, USESKILL_FAIL_LEVEL, 0);