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

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at hudson.model.queue.Executables.getEstimatedDurationFor(
at hudson.model.Executor.getIdleStartMilliseconds(
at com.cloudbees.jenkins.plugins.mtslavescloud.MansionComputer.getIdleStartMillisecondsAfterConnect(
at com.cloudbees.jenkins.plugins.mtslavescloud.MansionRetentionStrategy.isIdleForTooLong(

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