diff --git a/IISMainHandler/WebContext.cs b/IISMainHandler/WebContext.cs
index ba4ea91..2699d1b 100644
--- a/IISMainHandler/WebContext.cs
+++ b/IISMainHandler/WebContext.cs
@@ -41,8 +41,9 @@ namespace FLocal.IISHandler {
 		public XElement exportRequestParameters() {
 			return new XElement("get",
 				from i in Enumerable.Range(0, this.httprequest.QueryString.Count)
+				where this.httprequest.QueryString.GetKey(i) != null
 				select new XElement("param",
-					new XAttribute("name", this.httprequest.QueryString.GetKey(i).ToString()),
+					new XAttribute("name", this.httprequest.QueryString.GetKey(i)),
 					this.httprequest.QueryString[i]
 				)
 			);