diff --git a/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js b/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js
index 7af139952..94038e13a 100644
--- a/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js
+++ b/runtime/JavaScript/src/antlr4/error/ErrorStrategy.js
@@ -267,7 +267,7 @@ DefaultErrorStrategy.prototype.reportNoViableAlternative = function(recognizer,
         if (e.startToken.type===Token.EOF) {
             input = "<EOF>";
         } else {
-            input = tokens.getText(new Interval(e.startToken, e.offendingToken));
+            input = tokens.getText(new Interval(e.startToken.tokenIndex, e.offendingToken.tokenIndex));
         }
     } else {
         input = "<unknown input>";
@@ -753,4 +753,4 @@ BailErrorStrategy.prototype.sync = function(recognizer) {
 };
 
 exports.BailErrorStrategy = BailErrorStrategy;
-exports.DefaultErrorStrategy = DefaultErrorStrategy;
\ No newline at end of file
+exports.DefaultErrorStrategy = DefaultErrorStrategy;