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

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java.lang.NullPointerException:
at mekhq.campaign.unit.Unit.isCommander(Unit.java:3163)
at mekhq.campaign.ResolveScenarioTracker.checkStatusOfPersonnel(ResolveScenarioTracker.java:683)
at mekhq.campaign.ResolveScenarioTracker.processMulFiles(ResolveScenarioTracker.java:188)

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