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-rw-r--r--browser/components/sessionstore/content/aboutSessionRestore.js4
1 files changed, 3 insertions, 1 deletions
diff --git a/browser/components/sessionstore/content/aboutSessionRestore.js b/browser/components/sessionstore/content/aboutSessionRestore.js
index 165f48041..8f265235d 100644
--- a/browser/components/sessionstore/content/aboutSessionRestore.js
+++ b/browser/components/sessionstore/content/aboutSessionRestore.js
@@ -289,7 +289,9 @@ var treeView = {
get rowCount() { return gTreeData.length; },
setTree: function(treeBox) { this.treeBox = treeBox; },
getCellText: function(idx, column) { return gTreeData[idx].label; },
- isContainer: function(idx) { return "open" in gTreeData[idx]; },
+ isContainer: function(idx) {
+ return gTreeData[idx] ? "open" in gTreeData[idx] : false;
+ },
getCellValue: function(idx, column){ return gTreeData[idx].checked; },
isContainerOpen: function(idx) { return gTreeData[idx].open; },
isContainerEmpty: function(idx) { return false; },