diff --git a/modules/console/console.lua b/modules/console/console.lua
index 5246cc41..5555f19c 100644
--- a/modules/console/console.lua
+++ b/modules/console/console.lua
@@ -44,6 +44,7 @@ function Console.create()
 end
 
 function Console.destroy()
+  Logger.setOnLog(nil)
   console:destroy()
   console = nil
 end
diff --git a/src/framework/luascript/luainterface.cpp b/src/framework/luascript/luainterface.cpp
index 58b5370b..fd8b03d6 100644
--- a/src/framework/luascript/luainterface.cpp
+++ b/src/framework/luascript/luainterface.cpp
@@ -661,12 +661,6 @@ bool LuaInterface::next(int index)
     return lua_next(L, index);
 }
 
-void LuaInterface::copy(int index)
-{
-    assert(hasIndex(index));
-    lua_pushvalue(L, index);
-}
-
 void LuaInterface::getStackFunction(int level)
 {
     lua_Debug ar;
@@ -679,6 +673,7 @@ void LuaInterface::getStackFunction(int level)
 void LuaInterface::getRef(int ref)
 {
     lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+    //logTraceDebug(ref);
 }
 
 void LuaInterface::getWeakRef(int weakRef)
@@ -718,12 +713,14 @@ void LuaInterface::getMetatable(int index)
 void LuaInterface::getField(const char* key, int index)
 {
     assert(hasIndex(index));
+    assert(isUserdata(index) || isTable(index));
     lua_getfield(L, index, key);
 }
 
 void LuaInterface::setField(const char* key, int index)
 {
     assert(hasIndex(index));
+    assert(isUserdata(index) || isTable(index));
     lua_setfield(L, index, key);
 }
 
diff --git a/src/framework/luascript/luainterface.h b/src/framework/luascript/luainterface.h
index 6bde3950..a16edc33 100644
--- a/src/framework/luascript/luainterface.h
+++ b/src/framework/luascript/luainterface.h
@@ -175,7 +175,6 @@ public:
     void insert(int index);
     void remove(int index);
     bool next(int index = -2);
-    void copy(int index = -1);
 
     void getStackFunction(int level = 0);
 
diff --git a/src/framework/luascript/luaobject.cpp b/src/framework/luascript/luaobject.cpp
index 416c0b04..9cf725e1 100644
--- a/src/framework/luascript/luaobject.cpp
+++ b/src/framework/luascript/luaobject.cpp
@@ -12,8 +12,10 @@ LuaObject::~LuaObject()
 
 void LuaObject::releaseLuaFieldsTable()
 {
-    if(m_fieldsTableRef != -1)
+    if(m_fieldsTableRef != -1) {
         g_lua.unref(m_fieldsTableRef);
+        m_fieldsTableRef = -1;
+    }
 }
 
 void LuaObject::luaSetField(const std::string& key)
diff --git a/src/framework/ui/uiwidget.cpp b/src/framework/ui/uiwidget.cpp
index eef070ee..c9c4cd15 100644
--- a/src/framework/ui/uiwidget.cpp
+++ b/src/framework/ui/uiwidget.cpp
@@ -31,7 +31,6 @@ UIWidget::UIWidget(UIWidgetType type)
 
 UIWidget::~UIWidget()
 {
-    //logTraceDebug(m_id);
     if(!m_destroyed)
         logWarning("widget '", m_id, "' was destructed without being explicit destroyed");
 }