diff --git a/lib/chrome.js b/lib/chrome.js
index 654c5d4..16bb024 100644
--- a/lib/chrome.js
+++ b/lib/chrome.js
@@ -66,7 +66,7 @@ var ChromeObject = function() {
 	};
 	
 	this.setDebuggingPort = function(n) {
-		this.debuggingPort = n;
+		this.debuggingPort = (typeof(n) !== "number" ? this.debuggingPort : n);
 	}
 
 	this.createShoutcut = function(url) {
@@ -161,7 +161,7 @@ var ChromeObject = function() {
 			if (this.inPrivate) {
 				cmd.push("--incognito");
 			}
-			
+
 			if (this.debuggingPort > 0) {
 				cmd.push("--remote-debugging-port=" + this.debuggingPort);
 			}