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Exception java.lang.NullPointerException: Attempt to read from field 'java.lang.String io ...

at io.flutter.plugins.firebase.messaging.FlutterFirebaseMessagingBackgroundExecutor.lambda$startBackgroundIsolate$0 (FlutterFirebaseMessagingBackgroundExecutor.java ...
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NullPointerException at okio.OutputStreamSink.write

Fatal Exception: java.lang.NullPointerException: at okio.OutputStreamSink.write(OutputStreamSink.java:55) at okio.AsyncTimeout$sink$1.write(AsyncTimeout.kt:102) at ...