diff --git a/DataTreeCore.cpp b/DataTreeCore.cpp
index 69a116a..2e882ae 100644
--- a/DataTreeCore.cpp
+++ b/DataTreeCore.cpp
@@ -527,7 +527,7 @@ const char * CDataTree::GetStr( TDataMember * BaseMember, const char * Path, con
         return Member->Value;
     }
     else {
-        return NULL;
+        return Default;
     }
 }
 //---------------------------------------------------------------------------
@@ -549,7 +549,7 @@ const char * CDataTree::GetStr( TDataMember * BaseMember, const char * Path, int
     }
     else {
         Len = 0;
-        return NULL;
+        return Default;
     }
 }
 //---------------------------------------------------------------------------