diff --git a/src/ai.c b/src/ai.c
index 6d882ce..aae8f2f 100644
--- a/src/ai.c
+++ b/src/ai.c
@@ -457,8 +457,13 @@ static int ai_pushtask(lua_State* L) {
 static int ai_poptask(lua_State* L) {
   (void)L; /* Just a hack to avoid -W -Wall warnings. */
   Task* t = cur_pilot->task;
-  cur_pilot->task = t->next;
-  t->next = NULL;
+  if(t != NULL) {
+    cur_pilot->task = t->next;
+    t->next = NULL;
+  } else {
+    LLUA_DEBUG("Trying to pop task when there are no tasks in stack");
+    return 0;
+  }
   ai_freetask(t);
   return 0;
 }