Bestee offline Voice assistant crashing

I tried to install the app Bestee to make use of an offline voice assistant. Unfortunately the app crashes while starting.

Here's the log attached

time: 1609523584995 msg: java.lang.NullPointerException: Attempt to invoke interface method 'int android.content.SharedPreferences.getInt(java.lang.String, int)' on a null object reference stacktrace: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.emileferreira.bestee/com.emileferreira.bestee.MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'int android.content.SharedPreferences.getInt(java.lang.String, int)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:940) Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int android.content.SharedPreferences.getInt(java.lang.String, int)' on a null object reference at com.emileferreira.bestee.MainActivity.onInit(Unknown Source:5) at android.speech.tts.TextToSpeech.dispatchOnInit(TextToSpeech.java:835) at android.speech.tts.TextToSpeech.initTts(TextToSpeech.java:813) at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:744) at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:723) at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:707) at com.emileferreira.bestee.MainActivity.onCreate(Unknown Source:69) at android.app.Activity.performCreate(Activity.java:7824) at android.app.Activity.performCreate(Activity.java:7813) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245) ... 11 more

Start by reproducing the crash during app startup and inspect MainActivity.onCreate and its onInit callback, where the log identifies the null SharedPreferences access. Confirm the app reaches the main screen without the reported NullPointerException, including the TextToSpeech initialization path.