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Exception is thrown while performing text search in onDocumentLoaded callback

An exception is thrown while performing text search in onDocumentLoaded callback.


Issue reproducing codes:
import 'package:flutter/material.dart';

import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'PDF viewer demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              child: Text(
                'Open PDF'
              ),
              onPressed: (){
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => MyPDFViewer()),
                );
              },
            ),
          ],
        ),
      ),
    );
  }
}

class MyPDFViewer extends StatefulWidget {
  @override
  _MyPDFViewerState createState() => _MyPDFViewerState();
}

class _MyPDFViewerState extends State {
  final GlobalKey _pdfViewerKey = GlobalKey();
  final PdfViewerController _pdfViewerController = PdfViewerController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("PDF Viewer"),
      ),
      body: Stack(
        children: [
          Positioned.fill(
            child: SfPdfViewer.network(
              'https://cdn.syncfusion.com/content/PDFViewer/flutter-succinctly.pdf',
              key: _pdfViewerKey,
              controller: _pdfViewerController,
              onDocumentLoaded: (PdfDocumentLoadedDetails details) {
                print("trying to find word");
                _pdfViewerController.searchText("Flutter");
              },
            ),
          ),
          Positioned(
            right: 50,
            bottom: 50,
            child: ElevatedButton(
              child: Text("Back"),
              onPressed: () {
                Navigator.pop(context);
              },
            ),
          ),
        ],
      )
    );
  }
}