diff --git a/chrome/content/zotero/xpcom/data/collection.js b/chrome/content/zotero/xpcom/data/collection.js
index 54469b11c9..7cf6b7aeed 100644
--- a/chrome/content/zotero/xpcom/data/collection.js
+++ b/chrome/content/zotero/xpcom/data/collection.js
@@ -676,9 +676,12 @@ Zotero.Collection.prototype.serialize = function(nested) {
 }
 
 
-Zotero.Collection.prototype.fromJSON = Zotero.Promise.coroutine(function* (json) {
-	yield this.loadAllData();
-	
+/**
+ * Populate the object's data from an API JSON data object
+ *
+ * If this object is identified (has an id or library/key), loadAllData() must have been called.
+ */
+Zotero.Collection.prototype.fromJSON = function (json) {
 	if (!json.name) {
 		throw new Error("'name' property not provided for collection");
 	}
@@ -687,7 +690,7 @@ Zotero.Collection.prototype.fromJSON = Zotero.Promise.coroutine(function* (json)
 	
 	// TODO
 	//this.setRelations(json.relations);
-});
+}
 
 
 Zotero.Collection.prototype.toResponseJSON = Zotero.Promise.coroutine(function* (options = {}) {
diff --git a/chrome/content/zotero/xpcom/data/item.js b/chrome/content/zotero/xpcom/data/item.js
index 6e78c9209b..1380a3c466 100644
--- a/chrome/content/zotero/xpcom/data/item.js
+++ b/chrome/content/zotero/xpcom/data/item.js
@@ -3708,11 +3708,12 @@ Zotero.Item.prototype.isCollection = function() {
 }
 
 
-Zotero.Item.prototype.fromJSON = Zotero.Promise.coroutine(function* (json) {
-	if (this._identified) {
-		yield this.loadAllData();
-	}
-	
+/**
+ * Populate the object's data from an API JSON data object
+ *
+ * If this object is identified (has an id or library/key), loadAllData() must have been called.
+ */
+Zotero.Item.prototype.fromJSON = function (json) {
 	if (!json.itemType && !this._itemTypeID) {
 		throw new Error("itemType property not provided");
 	}
@@ -3843,7 +3844,7 @@ Zotero.Item.prototype.fromJSON = Zotero.Promise.coroutine(function* (json) {
 		let note = json.note;
 		this.setNote(note !== undefined ? note : "");
 	}
-});
+}
 
 
 /**
diff --git a/chrome/content/zotero/xpcom/search.js b/chrome/content/zotero/xpcom/search.js
index 7b296f80d5..8b593d4c04 100644
--- a/chrome/content/zotero/xpcom/search.js
+++ b/chrome/content/zotero/xpcom/search.js
@@ -819,9 +819,12 @@ Zotero.Search.prototype.search = Zotero.Promise.coroutine(function* (asTempTable
 });
 
 
-Zotero.Search.prototype.fromJSON = Zotero.Promise.coroutine(function* (json) {
-	yield this.loadAllData();
-	
+/**
+ * Populate the object's data from an API JSON data object
+ *
+ * If this object is identified (has an id or library/key), loadAllData() must have been called.
+ */
+Zotero.Search.prototype.fromJSON = function (json) {
 	if (!json.name) {
 		throw new Error("'name' property not provided for search");
 	}
@@ -835,7 +838,7 @@ Zotero.Search.prototype.fromJSON = Zotero.Promise.coroutine(function* (json) {
 			condition.value
 		);
 	}
-});
+}
 
 Zotero.Collection.prototype.toResponseJSON = Zotero.Promise.coroutine(function* (options = {}) {
 	var json = yield this.constructor._super.prototype.toResponseJSON.apply(this, options);
diff --git a/test/tests/itemTest.js b/test/tests/itemTest.js
index 5960fab115..486677187b 100644
--- a/test/tests/itemTest.js
+++ b/test/tests/itemTest.js
@@ -954,7 +954,7 @@ describe("Zotero.Item", function () {
 				dateModified: "2015-06-07T20:58:00Z",
 			};
 			var item = new Zotero.Item;
-			yield item.fromJSON(json);
+			item.fromJSON(json);
 			assert.equal(item.getField('accessDate'), '2015-06-07 20:56:00');
 			assert.equal(item.dateAdded, '2015-06-07 20:57:00');
 			assert.equal(item.dateModified, '2015-06-07 20:58:00');
@@ -968,7 +968,7 @@ describe("Zotero.Item", function () {
 				dateModified: "2015-06-07 20:58:00",
 			};
 			var item = new Zotero.Item;
-			yield item.fromJSON(json);
+			item.fromJSON(json);
 			assert.strictEqual(item.getField('accessDate'), '');
 			// DEBUG: Should these be null, or empty string like other fields from getField()?
 			assert.isNull(item.dateAdded);
@@ -992,14 +992,14 @@ describe("Zotero.Item", function () {
 			};
 			
 			var item = new Zotero.Item;
-			yield item.fromJSON(json);
+			item.fromJSON(json);
 			var id = yield item.saveTx();
 			assert.sameDeepMembers(item.getCreatorsJSON(), json.creators);
 		})
 		
 		it("should map a base field to an item-specific field", function* () {
 			var item = new Zotero.Item("bookSection");
-			yield item.fromJSON({
+			item.fromJSON({
 				"itemType":"bookSection",
 				"publicationTitle":"Publication Title"
 			});