From 3f8fb5817d4986214469e3b73e666acfa5d5fe10 Mon Sep 17 00:00:00 2001
From: Christian Heinrich <franz-christian.heinrich@inria.fr>
Date: Thu, 23 Jul 2015 15:19:16 +0200
Subject: [PATCH] [Lua] Fixed garbage collection segfault

---
 src/bindings/lua/lua_task.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/bindings/lua/lua_task.c b/src/bindings/lua/lua_task.c
index 5aa00f8350..890bbe63f9 100644
--- a/src/bindings/lua/lua_task.c
+++ b/src/bindings/lua/lua_task.c
@@ -419,6 +419,11 @@ static const luaL_Reg task_functions[] = {
  */
 static int l_task_gc(lua_State* L)
 {
+  void *p = luaL_testudata(L, 1, TASK_MODULE_NAME);
+  if (p == NULL) {
+      return 0;
+  }
+
   msg_task_t task = *((msg_task_t*) luaL_checkudata(L, 1, TASK_MODULE_NAME));
   /* the task is NULL if I sent it to someone else */
   if (task != NULL) {
-- 
2.20.1