diff --git a/chrome/content/zotero/xpcom/attachments.js b/chrome/content/zotero/xpcom/attachments.js
index fa25564d77..470e6a8a12 100644
--- a/chrome/content/zotero/xpcom/attachments.js
+++ b/chrome/content/zotero/xpcom/attachments.js
@@ -358,13 +358,17 @@ Zotero.Attachments = new function(){
 	 *
 	 * @param {Object} params
 	 * @param {Blob} params.blob - Image to save
-	 * @param {Integer} params.parentItemID - Annotation item to add item to
+	 * @param {Integer} params.parentItemID - Note or annotation item to add item to
 	 * @param {Object} [params.saveOptions] - Options to pass to Zotero.Item::save()
 	 * @return {Promise<Zotero.Item>}
 	 */
 	this.importEmbeddedImage = async function ({ blob, parentItemID, saveOptions }) {
 		Zotero.debug('Importing note or annotation image');
 		
+		if (!parentItemID) {
+			throw new Error("parentItemID must be provided");
+		}
+		
 		var contentType = blob.type;
 		var fileExt;
 		switch (contentType) {
@@ -379,7 +383,7 @@ Zotero.Attachments = new function(){
 				break;
 			
 			default:
-				throw new Error(`Unsupported embedded image content type '${contentType}`);
+				throw new Error(`Unsupported embedded image content type '${contentType}'`);
 		}
 		var filename = 'image.' + fileExt;