diff --git a/Applications/DataExplorer/Base/TreeModel.cpp b/Applications/DataExplorer/Base/TreeModel.cpp
index 3a79fc4f65b99592ea3e9cd33c97233c84055540..a15777a0b0538763ca2c3bcc50c15280dc521ba7 100644
--- a/Applications/DataExplorer/Base/TreeModel.cpp
+++ b/Applications/DataExplorer/Base/TreeModel.cpp
@@ -176,7 +176,7 @@ Qt::ItemFlags TreeModel::flags(const QModelIndex& index) const
 {
     if (!index.isValid())
     {
-        return nullptr;
+        return Qt::NoItemFlags;
     }
 
     return Qt::ItemIsEnabled | Qt::ItemIsSelectable;