More debug prints and avoid null pointer.

modules/gamelib/ui/uiminimap.lua

@@ -257,7 +257,6 @@ end
 function UIMinimap:onStyleApply(styleName, styleNode)
   for name,value in pairs(styleNode) do
     if name == 'autowalk' then
-      print(value)
       self.autowalk = value
     end
   end

src/framework/ui/uimanager.cpp

@@ -447,9 +447,9 @@ UIWidgetPtr UIManager::createWidgetFromOTML(const OTMLNodePtr& widgetNode, const
     if(parent)
         parent->addChild(widget);
 
-    widget->callLuaField("onCreate");
-
     if(widget) {
+        widget->callLuaField("onCreate");
+
         widget->setStyleFromNode(styleNode);
 
         for(const OTMLNodePtr& childNode : styleNode->children()) {