Forbid object:attach(obj, ...) (#9762)

Fixes #9761

diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index d7afb84da6e11a219e0ff467f45595436d5c812a..77e1e7dc2b44ebae5a8ae140b7922d63214945e8 100644 (file)
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -674,8 +674,13 @@ int ObjectRef::l_set_attach(lua_State *L)
        ServerActiveObject *parent = getobject(parent_ref);
        if (co == NULL)
                return 0;
+
        if (parent == NULL)
                return 0;
+
+       if (co == parent)
+               throw LuaError("ObjectRef::set_attach: attaching object to itself is not allowed.");
+
        // Do it
        int parent_id = 0;
        std::string bone;