Fix property names

Close #199

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/parse.js b/lib/parse.js
index b3687201..c45c064e 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -168,7 +168,9 @@ function is_identifier_char(ch) {
 };
 
 function is_identifier_string(str){
-    for (var i = str.length; --i >= 0;) {
+    var i = str.length;
+    if (i == 0) return false;
+    while (--i >= 0) {
         if (!is_identifier_char(str.charAt(i)))
             return false;
     }