diff --git a/features/force_control.lua b/features/force_control.lua
index 1f0835c1..c8dafedc 100644
--- a/features/force_control.lua
+++ b/features/force_control.lua
@@ -61,7 +61,7 @@ local function get_valid_force(lua_force_or_name)
         return force
     end
 
-    if type(lua_force_or_name) ~= 'table' or not lua_force_or_name.valid then
+    if type(lua_force_or_name) ~= 'userdata' or not lua_force_or_name.valid then
         return
     end