luaa: only handle tables in loop check

Signed-off-by: Julien Danjou <julien@danjou.info>

luaa.c

@@ -561,6 +561,8 @@ luaA_hasitem(lua_State *L, const void *item)
 static bool
 luaA_isloop_check(lua_State *L, void_array_t *elems)
 {
+    if(lua_istable(L, -1))
+    {
         const void *object = lua_topointer(L, -1);
 
         /* Check that the object table is not already in the list */
@@ -584,6 +586,7 @@ luaA_isloop_check(lua_State *L, void_array_t *elems)
             /* remove value, keep key for next iteration */
             lua_pop(L, 1);
         }
+    }
     return true;
 }