diff --git a/chrome/content/zotero/xpcom/data/item.js b/chrome/content/zotero/xpcom/data/item.js
index 2abc9cdf7a..783afa414c 100644
--- a/chrome/content/zotero/xpcom/data/item.js
+++ b/chrome/content/zotero/xpcom/data/item.js
@@ -822,8 +822,9 @@ Zotero.Item.prototype.setField = function(field, value, loadIn) {
 	if (!loadIn) {
 		// Save date field as multipart date
 		// TEMP - filingDate
-		if ((Zotero.ItemFields.isFieldOfBase(fieldID, 'date') || field == 'filingDate') &&
-				!Zotero.Date.isMultipart(value)) {
+		if (value !== false
+				&& (Zotero.ItemFields.isFieldOfBase(fieldID, 'date') || field == 'filingDate')
+				&& !Zotero.Date.isMultipart(value)) {
 			value = Zotero.Date.strToMultipart(value);
 		}
 		// Validate access date