diff --git a/chrome/content/zotero/xpcom/data/collection.js b/chrome/content/zotero/xpcom/data/collection.js
index c210e4aed..ea27181a2 100644
--- a/chrome/content/zotero/xpcom/data/collection.js
+++ b/chrome/content/zotero/xpcom/data/collection.js
@@ -369,6 +369,7 @@ Zotero.Collection.prototype.addItem = function (itemID, options) {
 /**
  * Add multiple items to the collection in batch
  *
+ * Requires a transaction
  * Does not require a separate save()
  *
  * @param {Number[]} itemIDs
@@ -403,6 +404,7 @@ Zotero.Collection.prototype.addItems = Zotero.Promise.coroutine(function* (itemI
 /**
  * Remove a item from the collection. The item is not deleted from the library.
  *
+ * Requires a transaction
  * Does not require a separate save()
  *
  * @return {Promise}
@@ -425,22 +427,21 @@ Zotero.Collection.prototype.removeItems = Zotero.Promise.coroutine(function* (it
 	
 	var current = this.getChildItems(true);
 	
-	return Zotero.DB.executeTransaction(function* () {
-		for (let i=0; i<itemIDs.length; i++) {
-			let itemID = itemIDs[i];
-			
-			if (current.indexOf(itemID) == -1) {
-				Zotero.debug("Item " + itemID + " not a child of collection " + this.id);
-				continue;
-			}
-			
-			let item = yield this.ChildObjects.getAsync(itemID);
-			item.removeFromCollection(this.id);
-			yield item.save({
-				skipDateModifiedUpdate: true
-			})
+	Zotero.DB.requireTransaction();
+	for (let i=0; i<itemIDs.length; i++) {
+		let itemID = itemIDs[i];
+		
+		if (current.indexOf(itemID) == -1) {
+			Zotero.debug("Item " + itemID + " not a child of collection " + this.id);
+			continue;
 		}
-	}.bind(this));
+		
+		let item = yield this.ChildObjects.getAsync(itemID);
+		item.removeFromCollection(this.id);
+		yield item.save({
+			skipDateModifiedUpdate: true
+		})
+	}
 });
 
 
diff --git a/chrome/content/zotero/xpcom/itemTreeView.js b/chrome/content/zotero/xpcom/itemTreeView.js
index 3e2941e2c..922a4e87b 100644
--- a/chrome/content/zotero/xpcom/itemTreeView.js
+++ b/chrome/content/zotero/xpcom/itemTreeView.js
@@ -1883,13 +1883,15 @@ Zotero.ItemTreeView.prototype.deleteSelection = Zotero.Promise.coroutine(functio
 		collectionTreeRow.ref.deleteItems(ids);
 	}
 	else if (collectionTreeRow.isTrash() || collectionTreeRow.isPublications()) {
-		Zotero.Items.erase(ids);
+		yield Zotero.Items.eraseTx(ids);
 	}
 	else if (collectionTreeRow.isLibrary(true) || force) {
-		Zotero.Items.trashTx(ids);
+		yield Zotero.Items.trashTx(ids);
 	}
 	else if (collectionTreeRow.isCollection()) {
-		collectionTreeRow.ref.removeItems(ids);
+		yield Zotero.DB.executeTransaction(function* () {
+			yield collectionTreeRow.ref.removeItems(ids);
+		});
 	}
 	//this._treebox.endUpdateBatch();
 });
@@ -3047,7 +3049,9 @@ Zotero.ItemTreeView.prototype.drop = Zotero.Promise.coroutine(function* (row, or
 				throw new Error("Drag source must be a collection");
 			}
 			if (collectionTreeRow.id != sourceCollectionTreeRow.id) {
-				yield collectionTreeRow.ref.removeItems(toMove);
+				yield Zotero.DB.executeTransaction(function* () {
+					yield collectionTreeRow.ref.removeItems(toMove);
+				}.bind(this));
 			}
 		}
 	}