It may cause a `NullPointerException` on Android `6`.
```
java.lang.RuntimeException: Unable to create service com.termux.app.TermuxService: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String java.lang.CharSequence.toString()' on a null object reference
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3048)
at android.app.ActivityThread.access$2000(ActivityThread.java:156)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1493)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5609)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String java.lang.CharSequence.toString()' on a null object reference
at android.app.Notification$Builder.processLegacyText(Notification.java:3217)
at android.app.Notification$Builder.access$1100(Notification.java:2009)
at android.app.Notification$BigTextStyle.makeBigContentView(Notification.java:4283)
at android.app.Notification$BigTextStyle.populateBigContentView(Notification.java:4321)
at android.app.Notification$Style.buildStyled(Notification.java:3858)
at android.app.Notification$Builder.build(Notification.java:3661)
at com.termux.app.TermuxService.buildNotification(TermuxService.java:841)
at com.termux.app.TermuxService.runStartForeground(TermuxService.java:206)
at com.termux.app.TermuxService.onCreate(TermuxService.java:120)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3038)
... 8 more
```
- https://cs.android.com/android/platform/superproject/+/android-6.0.1_r1:frameworks/base/core/java/android/app/Notification.java;l=4135Closestermux/termux-app#5113
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