check offset size

glayzzle · Jan 19, 2017 · db5f6a2 · db5f6a2
1 parent c96c775
commit db5f6a2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/lexer.js b/src/lexer.js
@@ -154,7 +154,7 @@ Lexer.prototype.next = function () {
     }
     if (ch === ':') {
       ch = '=>'; // alias
-    } else if (ch === '=' && this._input[this.offset] === '>') {
+    } else if (ch === '=' && this.offset < this._input.length && this._input[this.offset] === '>') {
       ch += this.input();
     }
     return ch;