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How to Fix “Error 500: Java.Lang.NullPointerException”

The error 500: Java.lang.nullpointerexception is an error that is faced by some developers when executing their code. Moreover, end-users also encounter the error 500 ...
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java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference

Whenever I call await ContactsService.openDeviceContactPicker() and return (using bottom right button) without any selection in contact list, the following exception occurs ( App dies. ) ...
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InAppBrowserActivity.onCreate NullPointerException - Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference

Fatal Exception: java.lang.RuntimeException Unable to start activity ComponentInfo{com.example.app/com.pichillilorenzo.flutter_inappwebview.InAppBrowser ...