diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 7ecdf1abd..a2b2bed4d 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -4093,6 +4093,7 @@ var ZoteroPane = new function()
 				if (el.id == 'zotero-items-splitter') continue;
 				// And don't restore to min-width if splitter was collapsed
 				if (el.id == 'zotero-item-pane' && attr == 'width' && elValues[attr] == 250
+						&& 'zotero-items-splitter' in serializedValues
 						&& serializedValues['zotero-items-splitter'].state == 'collapsed') {
 					continue;
 				}