diff --git a/lib/main.dart b/lib/main.dart
index 910febe..d7ca483 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -12,6 +12,7 @@ import 'package:sharedinbox/data/db/database.dart';
 import 'package:sharedinbox/di.dart';
 import 'package:sharedinbox/ui/router.dart';
 import 'package:sharedinbox/ui/screens/crash_screen.dart';
+import 'package:stack_trace/stack_trace.dart' as stack_trace;
 
 void main({List<Override> overrides = const []}) {
   unawaited(
@@ -19,6 +20,15 @@ void main({List<Override> overrides = const []}) {
       () async {
         WidgetsFlutterBinding.ensureInitialized();
 
+        // Dart's async machinery propagates stack traces in chain format
+        // (with '===== asynchronous gap =====' separators). Flutter's
+        // StackFrame parser asserts on those lines, so strip them first.
+        FlutterError.demangleStackTrace = (StackTrace s) {
+          if (s is stack_trace.Chain) return s.toTrace().vmTrace;
+          if (s is stack_trace.Trace) return s.vmTrace;
+          return s;
+        };
+
         // Catch errors during build (e.g. layout exceptions) and show CrashScreen.
         ErrorWidget.builder = (details) => CrashScreen(
               exception: details.exception,
diff --git a/pubspec.lock b/pubspec.lock
index 1c49453..17e8bbd 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1021,7 +1021,7 @@ packages:
     source: hosted
     version: "0.44.4"
   stack_trace:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: stack_trace
       sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
diff --git a/pubspec.yaml b/pubspec.yaml
index b01c90a..08ba477 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -58,6 +58,9 @@ dependencies:
   flutter_local_notifications: ^21.0.0
   workmanager: ^0.9.0
 
+  # Stack trace chain-to-VM conversion for FlutterError.demangleStackTrace
+  stack_trace: ^1.12.1
+
   # App version metadata for crash reports
   package_info_plus: ^10.1.0
   share_plus: ^13.1.0