| Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
 | 
| diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
 | 
| index a39ba22b83a48f18866c9cca3468e42272c75a07..176f28d4fb413ed2448081f5b0a95f8b7b4e8191 100644
 | 
| --- a/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
 | 
| +++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
 | 
| @@ -626,7 +626,8 @@ Timeline.TimelinePanel = class extends UI.Panel {
 | 
|  
 | 
|    _clear() {
 | 
|      this._showLandingPage();
 | 
| -    this._detailsSplitWidget.hideSidebar();
 | 
| +    if (this._detailsSplitWidget)
 | 
| +      this._detailsSplitWidget.hideSidebar();
 | 
|      this._sessionGeneration = null;
 | 
|      this._recordingStartTime = 0;
 | 
|      this._reset();
 | 
| 
 |