Tried in different Browsers :
In Google Chrome the error is: TypeError: Cannot read property style of null
In Firefox: TypeError: obj.firstChild.firstChild is null
In Internet Explorer: Cannot retrieve the value style: the object is null or not defined
Also i tried to restore my Old backups don’t solve the problem
Finally Googled a lot ,i came i came to know from that the error is coming from your custom logo plugin
After uninstall Boom !!!!!
Works Great …..