diff --git a/src/core/network.js b/src/core/network.js
index 8100303dc..c39dc06ea 100644
--- a/src/core/network.js
+++ b/src/core/network.js
@@ -245,11 +245,13 @@ var NetworkManager = (function NetworkManagerClosure() {
         });
       } else if (pendingRequest.onProgressiveData) {
         pendingRequest.onDone(null);
-      } else {
+      } else if (chunk) {
         pendingRequest.onDone({
           begin: 0,
           chunk: chunk
         });
+      } else if (pendingRequest.onError) {
+        pendingRequest.onError(xhr.status);
       }
     },
 
diff --git a/src/core/worker.js b/src/core/worker.js
index 728ed3a4f..74ff464d4 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -236,7 +236,7 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
 
         onError: function onError(status) {
           var exception;
-          if (status === 404) {
+          if (status === 404 || status === 0 && /^file:/.test(source.url)) {
             exception = new MissingPDFException('Missing PDF "' +
                                                 source.url + '".');
             handler.send('MissingPDF', exception);