since today my jobs are failing right in vsphere-steps.

The code;

vSphere buildStep: [$class: 'TakeSnapshot', description: '', includeMemory: false, snapshotName: 'Base', vm: 'vm'], serverName: 'vSphere server'
vSphere buildStep: [$class: 'DeleteSnapshot', consolidate: true, failOnNoExist: false, snapshotName: 'oldBase', vm: 'vm' ], serverName: 'vSphere server' 

The output:
13:48:43 [vSphere]
13:48:43 [vSphere] Performing vSphere build step: "Delete a Snapshot"
13:48:43 [vSphere] Attempting to use server configuration: "vSphere server"
13:48:44 [vSphere] Deleting snapshot "oldBase" of VM vm...
13:48:44 [Pipeline] }
13:48:44 [Pipeline] // script
13:48:44 [Pipeline] }
13:48:44 [Pipeline] // stage
13:48:44 [Pipeline] }
13:48:44 [Pipeline] // withEnv
13:48:44 [Pipeline] }
13:48:44 [Pipeline] // node
13:48:45 [Pipeline] End of Pipeline
13:48:45 ERROR: Cannot invoke "java.lang.Boolean.booleanValue()" because "consolidate" is null
13:48:45 Finished: FAILURE
There were two Updates in a row of the vsphere plugin recently. I tried to go back one version with the plugin manager but that did not help yet.

I downgraded to 3.512.vfb_0824b_5068c: that version is working (I think the Plugin-Manager downgrade by one version did not work actually)