Merge pull request #2312 from ForbesLindesay/fix-double-exception-handling

Fix double handling of exceptions

Author: lukeapage

lib/less/render.js

@@ -53,12 +53,13 @@ module.exports = function(environment, ParseTree, ImportManager) {
             new Parser(context, imports, rootFileInfo)
                 .parse(input, function (e, root) {
                 if (e) { return callback(e); }
+                var result;
                 try {
                     var parseTree = new ParseTree(root, imports);
-                    var result = parseTree.toCSS(options);
-                    callback(null, result);
+                    result = parseTree.toCSS(options);
                 }
-                catch (err) { callback( err); }
+                catch (err) { return callback( err); }
+                callback(null, result);
             }, options);
         }
     };