diff --git a/src/app/Dictionary.h b/src/app/Dictionary.h
index 42b69d7..45436e5 100644
--- a/src/app/Dictionary.h
+++ b/src/app/Dictionary.h
@@ -242,11 +242,11 @@ public:
         _next = NULL;
     }
 
-    const char *stringValue() const {return _value == NULL ? "" : _value->toString();}
+    const char *stringValue() const {return _value == NULL ? NULL : _value->toString();}
     const char *getParameter(const unsigned int index) 
     {
       unsigned int position(0);
-        if(isListEmpty(_head->_next))return "";
+        if(isListEmpty(_head->_next))return NULL;
 
         Dictionary *cursor = _head->_next;
 
@@ -257,7 +257,7 @@ public:
             cursor = cursor->_next;
         }
 
-        return "";
+        return NULL;
     }
 protected:
     Dictionary(const char *parameter, T *value) : Dictionary()