java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at hudson.model.queue.Executables.getEstimatedDurationFor(Executables.java:69)
at hudson.model.Executor.getIdleStartMilliseconds(Executor.java:870)
at com.cloudbees.jenkins.plugins.mtslavescloud.MansionComputer.getIdleStartMillisecondsAfterConnect(MansionComputer.java:171)
at com.cloudbees.jenkins.plugins.mtslavescloud.MansionRetentionStrategy.isIdleForTooLong(MansionRetentionStrategy.java:103)

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