diff --git a/src/web/InputWaiter.js b/src/web/InputWaiter.js
index 33784edc..e39e06fd 100755
--- a/src/web/InputWaiter.js
+++ b/src/web/InputWaiter.js
@@ -214,6 +214,10 @@ InputWaiter.prototype.handleLoaderMessage = function(e) {
         fileLoaded.textContent = r.progress + "%";
     }
 
+    if (r.hasOwnProperty("error")) {
+        this.app.alert(r.error, "danger", 10000);
+    }
+
     if (r.hasOwnProperty("fileBuffer")) {
         log.debug("Input file loaded");
         this.fileBuffer = r.fileBuffer;
diff --git a/src/web/LoaderWorker.js b/src/web/LoaderWorker.js
index 2da381ed..bcb68829 100644
--- a/src/web/LoaderWorker.js
+++ b/src/web/LoaderWorker.js
@@ -46,5 +46,9 @@ self.loadFile = function(file) {
         seek();
     };
 
+    reader.onerror = function(e) {
+        self.postMessage({"error": file.error.message});
+    };
+
     seek();
 };