java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String[] android.security.IKeystoreService.list(java.lang.String, int)' on a null object reference
at android.security.KeyStore.list(KeyStore.java:211)
at com.android.settings.wifi.WifiConfigController.loadCertificates(WifiConfigController.java:981)
at com.android.settings.wifi.WifiConfigController.showSecurityFields(WifiConfigController.java:686)
at com.android.settings.wifi.WifiConfigController.<init>(WifiConfigController.java:254)
at com.android.settings.wifi.WifiDialog.onCreate(WifiDialog.java:72)
at android.app.Dialog.dispatchOnCreate(Dialog.java:394)
at android.app.Dialog.show(Dialog.java:295)
at android.app.DialogFragment.onStart(DialogFragment.java:499)
at com.android.settings.SettingsPreferenceFragment$SettingsDialogFragment.onStart(SettingsPreferenceFragment.java:435)
at android.app.Fragment.performStart(Fragment.java:2244)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1002)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
at android.app.BackStackRecord.run(BackStackRecord.java:793)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:482)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
This is fixed by installing CM13-firmware.