Null check operator used on a null value. Error thrown .

[minhx3]

Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError
Null check operator used on a null value. Error thrown .
_PdfViewerState._normalizeMatrix (pdf_viewer.dart:1277)
_PdfViewerState._makeMatrixInSafeRange (pdf_viewer.dart:1267)
_PdfViewerTransformationController.value= (pdf_viewer.dart:1721)
_PdfViewerState._goTo.update (pdf_viewer.dart:1465)

! Flutter version 3.27.4 on channel [user-branch] 
! Upstream repository unknown source is not a standard remote.
  Set environment variable "FLUTTER_GIT_URL" to unknown source to dismiss this error.
• Framework revision d8a9f9a52e (6 weeks ago), 2025-01-31 16:07:18 -0500
• Engine revision 82bd5b7209
• Dart version 3.6.2
• DevTools version 2.40.3