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

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java.lang.NullPointerException:
at java.util.Hashtable.put(Hashtable.java:459)
at java.util.Hashtable.putAll(Hashtable.java:523)
at org.aeonbits.owner.PropertiesManager.merge(PropertiesManager.java:349)
at org.aeonbits.owner.PropertiesManager.load(PropertiesManager.java:219)
at org.aeonbits.owner.PropertiesManager.load(PropertiesManager.java:207)
at org.aeonbits.owner.PropertiesInvocationHandler.(PropertiesInvocationHandler.java:54)
at org.aeonbits.owner.DefaultFactory.create(DefaultFactory.java:46)
at org.aeonbits.owner.ConfigFactory.create(ConfigFactory.java:66)
at org.aeonbits.owner.issues.Issue184.before(Issue184.java:31)

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