详见https://www.veeam.com/kb2784

KB ID: 2784
Product: Veeam Backup & Replication;Veeam Backup & Replication Cloud Edition
Version: 9.5.0.1922
Published: 2018-10-17
Last Modified: 2018-11-26
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Challenge
After updating vCenter to 6.7U1, processing of all VMs fails with "Object reference not set to an instance of an object."

Cause
The issue is triggered by an update to the vSphere API version in vCenter 6.7 U1.
Solution
Create the following registry value on the Veeam Backup and Replication server.

Please, note that value and data fields should not contain any spaces.
Location: HKLM/SOFTWARE/Veeam/Veeam Backup and Replication
Value: vmwareOverrideApiVersion
Type: Multi-String Value (REG_MULTI_SZ)
Data: 6.7.1=6.7

After creating the registry value above, you must reboot the Veeam Backup and Replication server.