1 files changed, 1 insertions, 0 deletions
diff --git a/src/JSON.js b/src/JSON.js
index baf3a2fa..69e1b4c0 100644
--- a/src/JSON.js
+++ b/src/JSON.js
@@ -11,6 +11,7 @@ function toPrettyJson(obj)  {
 };
 
 function fromJson(json) {
+  if (!json) return json;
   try {
     var parser = new Parser(json, true);
     var expression =  parser.primary();