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Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference	at com.money.manager.ex.utils.MyDatabaseUtils.fixDuplicates(MyDatabaseUtils.java:156)	at com.money.manager.ex.settings.DatabaseSettingsFragment$8.onPreferenceClick(DatabaseSettingsFragment.java:370)	at android.preference.Preference.performClick(Preference.java:1165)	at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:263)	at android.widget.AdapterView.performItemClick(AdapterView.java:340)	at android.widget.AbsListView.performItemClick(AbsListView.java:1530)	at android.widget.AbsListView$PerformClick.run(AbsListView.java:3698)	at android.widget.AbsListView$3.run(AbsListView.java:5682)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:145)	at android.app.ActivityThread.main(ActivityThread.java:6917)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)