From 56d937214611642f9ff176ea99b9c925ea2386ea Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Fri, 13 Jan 2017 06:51:03 -0500
Subject: [PATCH] Throw clearer error if invalid type is passed to
 File.getContentsAsync()

---
 chrome/content/zotero/xpcom/file.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/chrome/content/zotero/xpcom/file.js b/chrome/content/zotero/xpcom/file.js
index d03885d1d1..2e54259ff3 100644
--- a/chrome/content/zotero/xpcom/file.js
+++ b/chrome/content/zotero/xpcom/file.js
@@ -273,8 +273,13 @@ Zotero.File = new function(){
 		if (source instanceof Components.interfaces.nsIFile) {
 			source = source.path;
 		}
-		else if (source.startsWith('file:')) {
-			source = OS.Path.fromFileURI(source);
+		else if (typeof source == 'string') {
+			if (source.startsWith('file:')) {
+				source = OS.Path.fromFileURI(source);
+			}
+		}
+		else {
+			throw new Error(`Unsupported type '${typeof source}' for source`);
 		}
 		var options = {
 			encoding: charset ? charset : "utf-8"