Don't try to handle uart input until we have set up the buffer for it

app/user/user_main.c

@@ -80,15 +80,18 @@ void TEXT_SECTION_ATTR user_start_trampoline (void)
   call_user_start ();
 }
 
+static bool lua_started=false;
 // +================== New task interface ==================+
 static void start_lua(task_param_t param, uint8 priority) {
   char* lua_argv[] = { (char *)"lua", (char *)"-i", NULL };
   NODE_DBG("Task task_lua started.\n");
   lua_main( 2, lua_argv );
+  lua_started=true;
 }
 
 static void handle_input(task_param_t flag, uint8 priority) {
 //  c_printf("HANDLE_INPUT: %u %u\n", flag, priority);          REMOVE
+  if (lua_started)
     lua_handle_input (flag);
 }