http: check if incoming parser has already been freed

Fix #4948

This adds a check before setting the incoming parser
to null. Under certain circumstances it'll already be set to
null by freeParser().

Otherwise this will cause node to crash as it tries to set
null on something that is already null.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/http.js b/lib/http.js
index aafbe5f60f..1f52d31514 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -420,7 +420,7 @@ IncomingMessage.prototype._dump = function() {
     return;
 
   this._dumped = true;
-  this.socket.parser.incoming = null;
+  if (this.socket.parser) this.socket.parser.incoming = null;
   this.push(null);
   readStart(this.socket);
 };