diff --git a/CSharpTranslator/antlr3/src/cs2j/Utils/DirectoryHT.cs b/CSharpTranslator/antlr3/src/cs2j/Utils/DirectoryHT.cs
index f41cecc..03278ef 100644
--- a/CSharpTranslator/antlr3/src/cs2j/Utils/DirectoryHT.cs
+++ b/CSharpTranslator/antlr3/src/cs2j/Utils/DirectoryHT.cs
@@ -56,7 +56,14 @@ namespace RusticiSoftware.Translator.Utils
             }
             else
             {
-                return children[components[0]].ContainsKey(components[1]);
+                if (children.ContainsKey(components[0]))
+                {
+                    return children[components[0]].ContainsKey(components[1]);
+                }
+                else
+                {
+                    return false;        
+                }
             }
         }