My version is Odoo 14 community

Steps thats  I  did  as follows :

•  I have inherited the partner form view.
• Added a new notebook
• Added 13 pages  with one2many  records  inside that notebook
• When ever I click and Add a line in that pages, till the third page, everything is fine and working properly
• When I try to add a record on forth page,after saving the record on clicking the close button on pop up's top, a js error is coming saying classList of undefined. (Screen shot attached).  

  TypeError: Cannot read property 'classList' of undefined

Pleas help me