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

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java.lang.NullPointerException: 	at java.util.TreeMap.compare(Unknown Source)	at java.util.TreeMap.getEntry(Unknown Source)	at java.util.TreeMap.remove(Unknown Source)	at VehicleDB.store(VehicleDB.java:121)	at TestApp.main(TestApp.java:365)