diff --git a/chrome/content/zotero/xpcom/utilities_translate.js b/chrome/content/zotero/xpcom/utilities_translate.js
index 9d36220ef0..af489bf59d 100644
--- a/chrome/content/zotero/xpcom/utilities_translate.js
+++ b/chrome/content/zotero/xpcom/utilities_translate.js
@@ -326,6 +326,11 @@ Zotero.Utilities.Translate.prototype.doGet = function(urls, processor, done, res
 	
 	translate.incrementAsyncProcesses("Zotero.Utilities.Translate#doGet");
 	var xmlhttp = Zotero.HTTP.doGet(url, function(xmlhttp) {
+		if (xmlhttp.status >= 400) {
+			translate.complete(false, `HTTP GET ${url} failed with status code ${xmlhttp.status}`);
+			return;
+		}
+		
 		try {
 			if(processor) {
 				processor(xmlhttp.responseText, xmlhttp, url);
@@ -355,6 +360,11 @@ Zotero.Utilities.Translate.prototype.doPost = function(url, body, onDone, header
 	
 	translate.incrementAsyncProcesses("Zotero.Utilities.Translate#doPost");
 	var xmlhttp = Zotero.HTTP.doPost(url, body, function(xmlhttp) {
+		if (xmlhttp.status >= 400) {
+			translate.complete(false, `HTTP POST ${url} failed with status code ${xmlhttp.status}`);
+			return;
+		}
+		
 		try {
 			onDone(xmlhttp.responseText, xmlhttp);
 			translate.decrementAsyncProcesses("Zotero.Utilities.Translate#doPost");