Business Process Flow not working properly after CRM 2015 Update 1.2

Hi,

We are facing one strange issue in BPF in opportunity form after CRM 2015 Update 1.2.

On click of Next Stage the BPF is not moving to next stage instead we are getting following error in the console 

"Unable to get property 'firstChild' of undefined or null reference" global.ashx.

Any help would be appreciated.

Thanks,

Nishant Rana

http://nishantrana.wordpress.com https://twitter.com/#!/nishantranacrm