Silent fail with flutter speech_to_text - flutter

Question

I am trying to integrate speech to text into my flutter app. However, nothing I try is working. Here is my dart code:
import 'package:client/main.dart';
import 'package:flutter/material.dart';
import 'package:client/language/nlp.dart';
import 'package:speech_to_text/speech_recognition_result.dart';
import 'package:speech_to_text/speech_to_text.dart';
class Home extends StatefulWidget{
const Home({super.key});
#override
State<Home> createState() => HomeState();
}
class HomeState extends State<Home>{
#override
BuildContext context = navigatorKey.currentState!.context;
SpeechToText _speechToText = SpeechToText();
bool _speechEnabled = false;
String _lastWords = "";
Language nlp = Language();
#override
void initState(){
super.initState();
_initSpeech();
}
void _initSpeech() async {
_speechEnabled = await _speechToText.initialize();
setState(() {});
}
void _startListening() async {
await _speechToText.listen(onResult: _onSpeechResult);
setState(() {});
}
void _stopListening() async {
await _speechToText.stop();
setState(() {});
}
void _onSpeechResult(SpeechRecognitionResult result){
setState(() {
_lastWords = result.recognizedWords;
print(result.recognizedWords);
nlp.parseInput(result.recognizedWords);
});
}
#override
Widget build(BuildContext context){
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
padding: EdgeInsets.all(16),
child: const Text(
"Recognised words:",
style: TextStyle(fontSize: 20.0),
),
),
Expanded(
child: Container(
padding: EdgeInsets.all(16),
child: Text(
_speechToText.isListening
? '$_lastWords'
: _speechEnabled
? 'Tap the microphone to start listening...'
: "Speech not available", ),
),
)
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _speechToText.isNotListening ? _startListening : _stopListening,
child: Icon(_speechToText.isNotListening ? Icons.mic_off : Icons.mic),
),
);
}
}
Does anyone know of a way to make this work? No error message is being shown but the speech input is not being sent to the nlp.parseInput() function and is not being printed. I have tried googling it and can't find any solutions.