Error Adding new Child Page

[leigh-pointer]

When adding and new Child page in Page Management, on save framework errors with :

Error Saving Page {"PageId":0,"SiteId":1,"Path":null,"ParentId":null,"Name":"Page Home1","Title":null,"Order":0,"Url":null,"ThemeType":null,"DefaultContainerType":null,"HeadContent":null,"BodyContent":null,"Icon":null,"IsNavigation":false,"IsClickable":false,"UserId":null,"EffectiveDate":null,"ExpiryDate":null,"IsPersonalizable":false,"DeletedBy":null,"DeletedOn":null,"IsDeleted":false,"Panes":null,"Resources":null,"PermissionList":null,"Settings":null,"Level":0,"HasChildren":false,"EditMode":false,"LayoutType":null,"CreatedBy":null,"CreatedOn":"0001-01-01T00:00:00","ModifiedBy":null,"ModifiedOn":"0001-01-01T00:00:00"} Object reference not set to an instance of an object.

Error in Add.razor