check SentryTracer type in ttfd tracker (#2508)

* check type * update changelog
getsentry · Dec 17, 2024 · 38c0369 · 38c0369
1 parent 254c073
commit 38c0369
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,10 @@
 
 - Manual TTID ([#2477](https://github.com/getsentry/sentry-dart/pull/2477))
 
+### Improvements
+
+- Check `SentryTracer` type in TTFD tracker ([#2508](https://github.com/getsentry/sentry-dart/pull/2508))
+
 ### Enhancements
 
 - Warning (in a debug build) if a potentially sensitive widget is not masked or unmasked explicitly ([#2375](https://github.com/getsentry/sentry-dart/pull/2375))

diff --git a/flutter/lib/src/navigation/time_to_full_display_tracker.dart b/flutter/lib/src/navigation/time_to_full_display_tracker.dart
@@ -3,7 +3,6 @@
 import 'dart:async';
 
 import 'package:meta/meta.dart';
-
 // ignore: implementation_imports
 import 'package:sentry/src/sentry_tracer.dart';
 
@@ -42,8 +41,11 @@ class TimeToFullDisplayTracker {
     required ISentrySpan transaction,
     required DateTime startTimestamp,
   }) async {
+    if (transaction is! SentryTracer) {
+      return;
+    }
     _startTimestamp = startTimestamp;
-    _transaction = transaction as SentryTracer;
+    _transaction = transaction;
     _ttfdSpan = transaction.startChild(
       SentrySpanOperations.uiTimeToFullDisplay,
       description: '${transaction.name} full display',