Symptoms:
When approvers are administrators try to approve users time off booking from Approvals or Historical Time Off page respectively, the following error occurs,

"Object reference not set to an instance of an object."

Cause:
The Time off booking is approved email notification body is empty.

Resolution:

  • Log into Web TimeSheet as the administrator.
  • Select Administration from the top menu bar.
  • Select Communications from the left pane.
  • Click on E-mail Notifications at the side menu.
  • Edit the Time off booking is approved email notification and click Restore Defaults.
  • Click Save.

Note: Disabling the Time Off booking is approved e-mail notification will also resolve this issue.