Master page : object reference not set to an instance of object

We have a problem with a SharePoint 2010 Site, this site is suddenly throwing an error in the morning between 7:30 - 8:00 Am

and that error disappear also after that without anybody interaction and the site will get back to be working normally .

this is strange, I have worked on many SharePoint 2010 sites before and never face this issue . 

the error is : object reference not set to an instance of objects .

Stack trace:      at Microsoft.SharePoint.Publishing.WebControls.ConsoleUtilities.IsMasterPageGalleryUrlForSite(Uri uri)    at Microsoft.SharePoint.Publishing.WebControls.ConsoleVisibleUtilities.ConsoleAppliesInCurrentContext()    at Microsoft.SharePoint.Publishing.Internal.WebControls.PublishingRibbon.OnLoad(EventArgs e)    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
May 20th, 2015 2:38am

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