fixed issue #53

Author: yurijmikhalevich

lib/helpers.js

@@ -17,14 +17,16 @@ exports.prepareMetaData = function(meta) {
     makeObjectNonCircular(meta);
     cleanFieldNames(meta);
   }
-  var prepared = common.clone(meta);
+  var prepared = {};
   if (meta instanceof Error) {
     // This needed because Error's message, name and stack isn't
     // accessible through cycling properties and "common.clone" doesn't
     // copies them
     prepared.message = meta.message;
     prepared.name = meta.name;
     prepared.stack = meta.stack;
+  } else {
+    prepared = common.clone(meta);
   }
   return prepared;
 };

package.json

@@ -1,7 +1,7 @@
 {
   "name": "winston-mongodb",
   "license": "MIT",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "A MongoDB transport for winston",
   "author": "Charlie Robbins <[email protected]>",
   "contributors": [