diff --git a/server/scanner.js b/server/scanner.js
index c32ac3f..fe4da50 100644
--- a/server/scanner.js
+++ b/server/scanner.js
@@ -234,9 +234,14 @@ function convertNefToJpg(path, file) {
         path + "/" + file
       ]);
 
+      let error = "";
+      ufraw.stderr.on('data', function(data) {
+        error += data;
+      });
+
       ufraw.on('close', function(code) {
         if (code != 0) {
-          return reject("UFRAW for " + path + "/" + file + " returned an error: " + code);
+          return reject("UFRAW for " + path + "/" + file + " returned an error: ", error);
         }
         return mkdirPromise(path + "/raw").then(function() {
           fs.rename(path + "/" + file, path + "/raw/" + file, function(err) {