diff --git a/aspclassiccompiler/asp/BuiltInObjects/AspCookieCollection.cs b/aspclassiccompiler/asp/BuiltInObjects/AspCookieCollection.cs
index e43df25..18b5e62 100644
--- a/aspclassiccompiler/asp/BuiltInObjects/AspCookieCollection.cs
+++ b/aspclassiccompiler/asp/BuiltInObjects/AspCookieCollection.cs
@@ -46,6 +46,9 @@ namespace Dlrsoft.Asp.BuiltInObjects
                 else
                     cookie = _cookiecollection[(string)key];
 
+                if (cookie == null)
+                    return "";
+
                 if (_request)
                     return new AspReadCookie(cookie);
                 else
diff --git a/aspclassiccompiler/asp/BuiltInObjects/AspReadCookie.cs b/aspclassiccompiler/asp/BuiltInObjects/AspReadCookie.cs
index 8ddebaf..5feae22 100644
--- a/aspclassiccompiler/asp/BuiltInObjects/AspReadCookie.cs
+++ b/aspclassiccompiler/asp/BuiltInObjects/AspReadCookie.cs
@@ -50,7 +50,7 @@ namespace Dlrsoft.Asp
 
         public override string ToString()
         {
-            if (_cookie == null) return null;
+            if (_cookie == null) return "";
 
             StringBuilder sb = new StringBuilder();
             bool first = true;