mendix.sys.Data.get: error in error handler for xpath : Cannot read property 'style' of null (webcore.datasource.XPathSource)

Hi ,

While trying to open a one of tab of application so its showing below error message on Browser,

and this is keep going without further processing (same request/code has been running on same another application)

error message:---

mendix.sys.Data.get: error in error handler for xpath(xyz dummy name of xpath) : Cannot read property 'style' of null (webcore.datasource.XPathSource)

thanks