repl: ensure that 'repl.ignoreUndefined' is a boolean

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/repl.js b/lib/repl.js
index 89ac5685f67..2ee5c76aa0c 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -102,6 +102,7 @@ function REPLServer(prompt, stream, eval, useGlobal, ignoreUndefined) {
   var self = this;
 
   self.useGlobal = !!useGlobal;
+  self.ignoreUndefined = !!ignoreUndefined;
 
   self.eval = eval || function(code, context, file, cb) {
     var err, result;
@@ -290,7 +291,7 @@ function REPLServer(prompt, stream, eval, useGlobal, ignoreUndefined) {
       self.bufferedCommand = '';
 
       // If we got any output - print it (if no error)
-      if (!e && (!ignoreUndefined || ret !== undefined)) {
+      if (!e && (!self.ignoreUndefined || ret !== undefined)) {
         self.context._ = ret;
         self.outputStream.write(exports.writer(ret) + '\n');
       }