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

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java.lang.NullPointerException:
at biz.martyn.budget.CategoryComboBox.update(CategoryComboBox.java:24)
at biz.martyn.budget.CategoryComboBox.(CategoryComboBox.java:17)
at biz.martyn.budget.NewTransactionDialog.(NewTransactionDialog.java:36)
at biz.martyn.budget.TransactionsToolbar.(TransactionsToolbar.java:34)
at biz.martyn.budget.Budget.main(Budget.java:41)

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