Unknown Pipeline Node Step Error in Jenkins Executor

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I’m facing an issue where one of my Jenkins executors shows the error:

“Unknown pipeline node step”

I don’t see any logs related to this issue. When I click “Close”, the executor stops, and a new one starts without any errors. This happens intermittently, and I’m unsure what’s causing it.

Environment Details:

  • Jenkins Version: 2.49
  • Pipeline Type: Declarative
  • Node Configuration: controller-agent
  • Jenkins Logs Checked: Yes

What I Tried:

  1. Checked Manage Jenkins > System Log (No relevant logs found).
  2. Restarted the pipeline, and the issue disappeared.
  3. Verified that nodes/executors are running and connected properly.
  4. Ensured that all Jenkins plugins are up to date.

Questions:

  • Has anyone faced a similar issue before?
  • Where else can I check logs for more details?
  • Could this be due to agent disconnection or a temporary node issue?

Any insights would be greatly appreciated! Thanks in advance.