minor details, still getting null pointer if end of script is reached

5 jobs for grebing_luong_workbranch in 3 minutes and 6 seconds (queued for 1 second)
Name Stage Failure
failed
build:jdk10 Build There is an unknown failure, please try again

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BUILD FAILED in 25s
1 actionable task: 1 executed
ERROR: Job failed: exit code 1
failed
test Test There is an unknown failure, please try again

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BUILD FAILED in 10s
1 actionable task: 1 executed
ERROR: Job failed: exit code 1
failed
deploy Deploy There is an unknown failure, please try again

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BUILD FAILED in 10s
1 actionable task: 1 executed
ERROR: Job failed: exit code 1
failed
build:jdk9 Build There is an unknown failure, please try again

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BUILD FAILED in 29s
1 actionable task: 1 executed
ERROR: Job failed: exit code 1