Index: Source/devtools/front_end/CSSStyleModel.js |
diff --git a/Source/devtools/front_end/CSSStyleModel.js b/Source/devtools/front_end/CSSStyleModel.js |
index e83204509a24e566cc538952693d9706490aeecb..b165d6ea16da68cc3cb00ddddc2d98bda1839b8a 100644 |
--- a/Source/devtools/front_end/CSSStyleModel.js |
+++ b/Source/devtools/front_end/CSSStyleModel.js |
@@ -459,6 +459,8 @@ WebInspector.CSSStyleModel.prototype = { |
{ |
var header = this._styleSheetIdToHeader[id]; |
console.assert(header); |
+ if (!header) |
+ return; |
delete this._styleSheetIdToHeader[id]; |
var url = header.resourceURL(); |
var frameIdToStyleSheetIds = this._styleSheetIdsForURL[url]; |