diff --git a/chrome/content/zotero/xpcom/data/collection.js b/chrome/content/zotero/xpcom/data/collection.js
index 0244b578dd..4e1c1e6cec 100644
--- a/chrome/content/zotero/xpcom/data/collection.js
+++ b/chrome/content/zotero/xpcom/data/collection.js
@@ -362,7 +362,7 @@ Zotero.Collection.prototype._finalizeSave = Zotero.Promise.coroutine(function* (
 		Zotero.Notifier.trigger('add', 'collection', this.id);
 	}
 	else {
-		Zotero.Notifier.trigger('modify', 'collection', this.id, this._previousData);
+		Zotero.Notifier.trigger('modify', 'collection', this.id, { changed: this._previousData });
 	}
 	
 	// Invalidate cached child collections
diff --git a/chrome/content/zotero/xpcom/data/item.js b/chrome/content/zotero/xpcom/data/item.js
index 17129b6376..2c0a12c3d1 100644
--- a/chrome/content/zotero/xpcom/data/item.js
+++ b/chrome/content/zotero/xpcom/data/item.js
@@ -1218,9 +1218,7 @@ Zotero.Item.prototype._saveData = Zotero.Promise.coroutine(function* (env) {
 		sqlValues.push(parseInt(itemID));
 		yield Zotero.DB.queryAsync(sql, sqlValues);
 		
-		var notifierData = {};
-		notifierData[itemID] = { changed: this._previousData };
-		Zotero.Notifier.trigger('modify', 'item', itemID, notifierData);
+		Zotero.Notifier.trigger('modify', 'item', itemID, { changed: this._previousData });
 	}
 	
 	//
diff --git a/chrome/content/zotero/xpcom/notifier.js b/chrome/content/zotero/xpcom/notifier.js
index 8983917c4f..757d529a3a 100644
--- a/chrome/content/zotero/xpcom/notifier.js
+++ b/chrome/content/zotero/xpcom/notifier.js
@@ -138,11 +138,18 @@ Zotero.Notifier = new function(){
 			// Merge extraData keys
 			if (extraData) {
 				Zotero.debug("ADDING EXTRA DATA");
-				for (var dataID in extraData) {
-					Zotero.debug(dataID);
-					if (extraData[dataID]) {
-						Zotero.debug("YES");
-						_queue[type][event].data[dataID] = extraData[dataID];
+				// If just a single id, extra data can be keyed by id or passed directly
+				if (ids.length == 1) {
+					let id = ids[0];
+					_queue[type][event].data[id] = extraData[id] ? extraData[id] : extraData;
+				}
+				// For multiple ids, check for data keyed by the id
+				else {
+					for (let i = 0; i < ids.length; i++) {
+						let id = ids[i];
+						if (extraData[id]) {
+							_queue[type][event].data[id] = extraData[id];
+						}
 					}
 				}
 			}
diff --git a/chrome/content/zotero/xpcom/search.js b/chrome/content/zotero/xpcom/search.js
index cee68a6aaa..9a2bd7d6e0 100644
--- a/chrome/content/zotero/xpcom/search.js
+++ b/chrome/content/zotero/xpcom/search.js
@@ -260,7 +260,7 @@ Zotero.Search.prototype._finalizeSave = Zotero.Promise.coroutine(function* (env)
 		Zotero.Notifier.trigger('add', 'search', this.id);
 	}
 	else {
-		Zotero.Notifier.trigger('modify', 'search', this.id, this._previousData);
+		Zotero.Notifier.trigger('modify', 'search', this.id, { changed: this._previousData });
 	}
 	
 	if (isNew && Zotero.Libraries.isGroupLibrary(this.libraryID)) {