[Qurany App][v2.5.1] The app crashed when I tried to do full/random test after submitting 0/zero as the start from ayah and end ayah

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<ul> <li><span>Repository: <a href="https://github.com/MahmoudMabrok/QuranyApp" target="_blank" rel="noreferrer noopener" title="This link will take you away from hive.blog" class="external_link">https://github.com/MahmoudMabrok/QuranyApp <li>Project Name: Qurany App <li>My Submitted Issue: <a href="https://github.com/MahmoudMabrok/QuranyApp/issues/48" target="_blank" rel="noreferrer noopener" title="This link will take you away from hive.blog" class="external_link">here <li>My GitHub Account: <a href="https://github.com/sagorahmed" target="_blank" rel="noreferrer noopener" title="This link will take you away from hive.blog" class="external_link">here <h4>Expected behavior <p dir="auto">I expected that the app wouldn't crash after submitting "0" as the "start from ayah and end at ayah" for a full/random test. <h4>Actual behavior <p dir="auto">When I clicked on full/random test after entering "0" as the "start from and end at ayah" digit, then the app crashed. <h4>How to reproduce <p dir="auto">Here is every possible detail to reproduce the bug. <ol> <li>Open the app. <li>Go to the "Test" tab. <li>Give '0/zero' on the start from and end at ayah field. <li>Press on "FULL TEST" or "RANDOM TEST" and notice the bug. <ul> <li>App version: 2.5.1 <li>Operating system: Android 6.0.1 <h4>Recording Of The Bug <p dir="auto"> <h4>LogCat <pre><code>07-02 01:05:18.238 23615 23615 E AndroidRuntime: FATAL EXCEPTION: main 07-02 01:05:18.238 23615 23615 E AndroidRuntime: Process: education.mahmoud.quranyapp, PID: 23615 07-02 01:05:18.238 23615 23615 E AndroidRuntime: java.lang.NullPointerException: Attempt to read from field 'int education.mahmoud.quranyapp.data_layer.local.room.c.a' on a null object reference 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at education.mahmoud.quranyapp.feature.test_quran.TestFragment.a(Unknown Source) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at education.mahmoud.quranyapp.feature.test_quran.TestFragment.onbtnTestSaveRandom(Unknown Source) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at education.mahmoud.quranyapp.feature.test_quran.TestFragment_ViewBinding$2.a(Unknown Source) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at butterknife.a.a.onClick(Unknown Source) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.view.View.performClick(View.java:5714) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.widget.TextView.performClick(TextView.java:10932) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.view.View$PerformClick.run(View.java:22589) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.os.Looper.loop(Looper.java:148) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7325) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 07-02 01:05:18.238 23615 23615 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)