diff --git a/components/base_nodemcu/uart.c b/components/base_nodemcu/uart.c
index ee9641e5..218b3c9c 100644
--- a/components/base_nodemcu/uart.c
+++ b/components/base_nodemcu/uart.c
@@ -20,9 +20,11 @@ bool uart_on_data_cb(unsigned id, const char *buf, size_t len){
   if(!gL)
     return false;
 
+  int top = lua_gettop(gL);
   lua_rawgeti(gL, LUA_REGISTRYINDEX, uart_status[id].receive_rf);
   lua_pushlstring(gL, buf, len);
   lua_pcall(gL, 1, 0, 0);
+  lua_settop(gL, top);
   return !run_input;
 }
 
@@ -34,9 +36,11 @@ bool uart_on_error_cb(unsigned id, const char *buf, size_t len){
   if(!gL)
     return false;
 
+  int top = lua_gettop(gL);
   lua_rawgeti(gL, LUA_REGISTRYINDEX, uart_status[id].error_rf);
   lua_pushlstring(gL, buf, len);
   lua_pcall(gL, 1, 0, 0);
+  lua_settop(gL, top);
   return true;
 }
 
diff --git a/components/task/task.c b/components/task/task.c
index 3a3e0e20..9fa69e6f 100644
--- a/components/task/task.c
+++ b/components/task/task.c
@@ -55,7 +55,7 @@ task_handle_t task_get_id(task_callback_t t) {
 }
 
 
-bool task_post (task_prio_t priority, task_handle_t handle, task_param_t param)
+bool IRAM_ATTR task_post (task_prio_t priority, task_handle_t handle, task_param_t param)
 {
   if (priority >= TASK_PRIORITY_COUNT ||
       (handle & TASK_HANDLE_MASK) != TASK_HANDLE_MONIKER)