Crash when pressing 'Install Watch App' button

[jones139]

User reported crash:

***** DEVICE INFO
Brand: Redmi
Device: sea
Model: 23030RAC7Y
Manufacturer: Xiaomi
Product: sea_ru
SDK: 34
Release: 14

***** APP INFO
Version: 4.2.10
Installed On: 2025-01-06 23:08:22
Updated On: 2025-01-06 23:08:22
Current Date: 2025-01-09 10:11:46

***** ERROR LOG
java.lang.NullPointerException: Attempt to read from field 'uk.org.openseizuredetector.SdDataSource uk.org.openseizuredetector.SdServer.mSdDataSource' on a null object reference in method 'void uk.org.openseizuredetector.StartupActivity$2.onClick(android.view.View)'
at uk.org.openseizuredetector.StartupActivity$2.onClick(StartupActivity.java:191)
at android.view.View.performClick(View.java:7784)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1218)
at android.view.View.performClickInternal(View.java:7757)
at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
at android.view.View$PerformClick.run(View.java:31204)
at android.os.Handler.handleCallback(Handler.java:958)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:222)
at android.os.Looper.loop(Looper.java:314)
at android.app.ActivityThread.main(ActivityThread.java:8661)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:565)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)

[jones139]

I'm not sure what caused this, but we could easily check that mSdDataSource is not null before trying to call its method.

[jones139]

It seems to work fine for the Phone and Garmin data sources, but crashes for BLE2 data source.
There is a surprisingly large number of users seeing this crash, so I'd better fix it....