diff --git a/front_end/models/timeline_model/TimelineModel.ts b/front_end/models/timeline_model/TimelineModel.ts
index b77f94a23d..ef80eb1741 100644
--- a/front_end/models/timeline_model/TimelineModel.ts
+++ b/front_end/models/timeline_model/TimelineModel.ts
@@ -1211,7 +1211,7 @@ export class TimelineModelImpl {
 
   private processBrowserEvent(event: SDK.TracingModel.Event): void {
     if (event.name === RecordType.LatencyInfoFlow) {
-      if (event.args.chrome_latency_info.trace_id) {
+      if (event.args.chrome_latency_info?.trace_id) {
         this.knownInputEvents.add(event.args.chrome_latency_info.trace_id);
       }
       return;
diff --git a/front_end/panels/timeline/TimelineController.ts b/front_end/panels/timeline/TimelineController.ts
index bff15f5c6e..7a808a98ea 100644
--- a/front_end/panels/timeline/TimelineController.ts
+++ b/front_end/panels/timeline/TimelineController.ts
@@ -90,7 +90,7 @@ export class TimelineController implements SDK.TargetManager.SDKModelObserver<SD
     // 'disabled-by-default-v8.cpu_profiler'
     //   └ default: on, option: enableJSSampling
     const categoriesArray = [
-      '-*',
+      Root.Runtime.experiments.isEnabled('timelineShowAllEvents') ? '*' : '-*',
       TimelineModel.TimelineModel.TimelineModelImpl.Category.Console,
       TimelineModel.TimelineModel.TimelineModelImpl.Category.UserTiming,
       'devtools.timeline',
diff --git a/test/unittests/front_end/helpers/EnvironmentHelpers.ts b/test/unittests/front_end/helpers/EnvironmentHelpers.ts
index 6fc2821372..d816a3f8ad 100644
--- a/test/unittests/front_end/helpers/EnvironmentHelpers.ts
+++ b/test/unittests/front_end/helpers/EnvironmentHelpers.ts
@@ -48,6 +48,7 @@ const REGISTERED_EXPERIMENTS = [
   'protocolMonitor',
   'sourcesPrettyPrint',
   'wasmDWARFDebugging',
+  'timelineShowAllEvents',
   'timelineV8RuntimeCallStats',
   'timelineInvalidationTracking',
   'ignoreListJSFramesOnTimeline',