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Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference	at scala.collection.convert.Wrappers$JListWrapper.iterator(Wrappers.scala:88)	at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)	at scala.collection.AbstractIterable.foreach(Iterable.scala:54)	at scala.collection.TraversableOnce$class.addString(TraversableOnce.scala:357)	at scala.collection.AbstractTraversable.addString(Traversable.scala:104)	at scala.collection.TraversableOnce$class.mkString(TraversableOnce.scala:323)	at scala.collection.AbstractTraversable.mkString(Traversable.scala:104)	at scala.collection.TraversableOnce$class.mkString(TraversableOnce.scala:325)	at scala.collection.AbstractTraversable.mkString(Traversable.scala:104)	at com.github.shadowsocks.utils.TcpFastOpen$.enabled(TcpFastOpen.scala:49)	at com.github.shadowsocks.ShadowsocksSettings.com$github$shadowsocks$ShadowsocksSettings$$onPreferenceChange$body$16(ShadowsocksSettings.scala:162)	at com.github.shadowsocks.ShadowsocksSettings$$anonfun$17.onPreferenceChange(ShadowsocksSettings.scala:160)	at android.preference.Preference.callChangeListener(Preference.java:939)	at android.preference.TwoStatePreference.onClick(TwoStatePreference.java:65)	at android.preference.Preference.performClick(Preference.java:994)	at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:214)	at android.widget.AdapterView.performItemClick(AdapterView.java:310)	at android.widget.AbsListView.performItemClick(AbsListView.java:1155)	at android.widget.AbsListView$PerformClick.run(AbsListView.java:3126)	at android.widget.AbsListView$3.run(AbsListView.java:4041)	at android.os.Handler.handleCallback(Handler.java:751)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:154)	at android.app.ActivityThread.main(ActivityThread.java:6077)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)