Hyper-V backup fails: Error taking VM recovery checkpoint

Product Version

AhsayOBM: Pre-7.15.4.10

Operating System

Windows

Symptom

When performing a Hyper-V VM backup, the following error message is displayed on the backup client interface, or in the backup report:

No.	Type	Timestamp	Log
*	...	...	...
*	info	...	Start running pre-commands
*	info	...	Finished running pre-commands
*	erro	YYYY/MM/DD hh:mm:ss	Failed to take VM recovery checkpoint. Error = Object reference not set to an instance of an object., vm: virtual_machine_id
*	...	...	...

Cause

This issue can occur if the affected virtual machine is being backup by multiple backup sets that run at the same time (e.g. overlapping backup jobs of multiple backup sets).

Resolution

To resolve the issue, patch the AhsayOBM application to version 7.15.4.10 or above.

This issue affects a legacy version of our software. We strongly recommend upgrading to the latest AhsayCBS and AhsayOBM release (v9.15.0.0, as of 2025/May/15) for improved performance, compatibility, and security.