1 files changed, 4 insertions, 1 deletions

diff --git a/js/panels/css-panel/style-sheets-view.reel/style-sheets-view.js b/js/panels/css-panel/style-sheets-view.reel/style-sheets-view.js
index e2193ba0..a328cb65 100644
--- a/js/panels/css-panel/style-sheets-view.reel/style-sheets-view.js
+++ b/js/panels/css-panel/style-sheets-view.reel/style-sheets-view.js
@@ -96,13 +96,16 @@ exports.StyleSheetsView = Montage.create(Component, {
 
             var sheetComponent, oldDefaultSheet;
 
+            ///// Mark the appropriate component as the default, un-mark the previous default
             if(this.styleSheetList) {
                 sheetComponent = this.styleSheetList.childComponents[this.styleSheets.indexOf(sheet)];
                 if(sheetComponent) {
                     sheetComponent['default'] = true;
                     if(this._defaultStyleSheet) {
                         oldDefaultSheet = this.styleSheetList.childComponents[this.styleSheets.indexOf(this._defaultStyleSheet)];
-                        oldDefaultSheet['default'] = false;
+                        if(oldDefaultSheet) {
+                            oldDefaultSheet['default'] = false;
+                        }
                     }
                 }
             }