diff --git a/lib/server/size.js b/lib/server/size.js
index ef50ed47..55fd2d04 100644
--- a/lib/server/size.js
+++ b/lib/server/size.js
@@ -31,15 +31,8 @@
             stopOnError = options.stopOnError;
         }
         
-        function calcSize(error, size) {
-            if (error)
-                if (stopOnError)
-                    Util.exec(callback, error);
-                else
-                    size = 0;
-                
-            total      += size;
-            
+        function calcSize(size) {
+            total      += size || 0;
         }
         
         processDir(dir, calcSize, options, function(error) {
@@ -50,7 +43,7 @@
             else
                 result  = total;
             
-            Util.exec(callback, error, result);
+            callback(error, result);
         });
     };
    
@@ -79,14 +72,15 @@
             if (!wasError || !stopOnError) {
                 if (error) {
                     wasError    = true;
-                    func(error);
+                    callback(error);
                 } else {
                     isDir   = stat.isDirectory();
                     
                     if (!isDir)
-                        func(null, stat.size);
+                        func(stat.size);
                     else if (isDir) {
                         ++asyncRunning;
+                        
                         fs.readdir(dir, function(error, files) {
                             onReaddir(error, files, dir);
                         });