[Xposed General] :
sorry for the delay.

not, FC don't contains the Xposed now.

E/AndroidRuntime( 9612): Process: com.android.contacts, PID: 9612
E/AndroidRuntime( 9612): java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
E/AndroidRuntime( 9612):	at java.util.ArrayList.get(ArrayList.java:310)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.EventFieldEditorView.initialize(EventFieldEditorView.java:726)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.EventFieldEditorView.setValues(EventFieldEditorView.java:265)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.KindSectionView.createEditorView(KindSectionView.java:328)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.KindSectionView.rebuildFromState(KindSectionView.java:251)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.KindSectionView.setState(KindSectionView.java:200)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.RawContactEditorView.setState(RawContactEditorView.java:430)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.ContactEditorFragment.bindEditors(ContactEditorFragment.java:1296)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.ContactEditorFragment.bindEditorsForExistingContact(ContactEditorFragment.java:814)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.ContactEditorFragment.setData(ContactEditorFragment.java:772)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.ContactEditorFragment$17.onLoadFinished(ContactEditorFragment.java:3731)
E/AndroidRuntime( 9612):	at com.android.contacts.editor.ContactEditorFragment$17.onLoadFinished(ContactEditorFragment.java:3701)
E/AndroidRuntime( 9612):	at android.app.LoaderManagerImpl$LoaderInfo.callOnLoadFinished(LoaderManager.java:483)
E/AndroidRuntime( 9612):	at android.app.LoaderManagerImpl$LoaderInfo.onLoadComplete(LoaderManager.java:451)
E/AndroidRuntime( 9612):	at android.content.Loader.deliverResult(Loader.java:144)
E/AndroidRuntime( 9612):	at com.android.contacts.ContactLoader.deliverResult(ContactLoader.java:1328)
E/AndroidRuntime( 9612):	at com.android.contacts.ContactLoader.deliverResult(ContactLoader.java:83)
E/AndroidRuntime( 9612):	at android.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:265)
E/AndroidRuntime( 9612):	at android.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:92)
E/AndroidRuntime( 9612):	at android.os.AsyncTask.finish(AsyncTask.java:632)
E/AndroidRuntime( 9612):	at android.os.AsyncTask.access$600(AsyncTask.java:177)
E/AndroidRuntime( 9612):	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
E/AndroidRuntime( 9612):	at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime( 9612):	at android.os.Looper.loop(Looper.java:136)
E/AndroidRuntime( 9612):	at android.app.ActivityThread.main(ActivityThread.java:5118)
E/AndroidRuntime( 9612):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 9612):	at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime( 9612):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
E/AndroidRuntime( 9612):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
E/AndroidRuntime( 9612):	at dalvik.system.NativeStart.main(Native Method)

Provably a LG bug.

Tested more and it seems only occurs when I try to edit a contact that includes a special date, like birthday.

Thanks for your time!