diff --git a/lib/xcore.js b/lib/xcore.js
index be12cba..956904e 100644
--- a/lib/xcore.js
+++ b/lib/xcore.js
@@ -451,7 +451,8 @@ XClient.prototype.expectReplyHeader = function()
                         if (!handled)
                             client.emit('error', error);
                         // TODO: should we delete seq2stack and reply even if there is no handler?
-                        delete client.seq2stack[seq_num];
+			if (client.options.debug)
+                          delete client.seq2stack[seq_num];
                         delete client.replies[seq_num];
                     } else
                         client.emit('error', error);