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-rw-r--r--browser/components/sessionstore/content/aboutSessionRestore.js3
1 files changed, 3 insertions, 0 deletions
diff --git a/browser/components/sessionstore/content/aboutSessionRestore.js b/browser/components/sessionstore/content/aboutSessionRestore.js
index 8a9410aa8..165f48041 100644
--- a/browser/components/sessionstore/content/aboutSessionRestore.js
+++ b/browser/components/sessionstore/content/aboutSessionRestore.js
@@ -188,6 +188,9 @@ function onListClick(aEvent) {
if (aEvent.button == 2)
return;
+ if (!treeView.treeBox) {
+ return;
+ }
var cell = treeView.treeBox.getCellAt(aEvent.clientX, aEvent.clientY);
if (cell.col) {
// Restore this specific tab in the same window for middle/double/accel clicking