diff --git a/nw/gui/itemdetails.py b/nw/gui/itemdetails.py
index 91c8aa61..6979a75e 100644
--- a/nw/gui/itemdetails.py
+++ b/nw/gui/itemdetails.py
@@ -198,6 +198,8 @@ class GuiItemDetails(QWidget):
     def clearDetails(self):
         """Clear all the data values.
         """
+        self.theHandle = None
+
         self.labelFlag.setPixmap(QPixmap(1, 1))
         self.statusFlag.setPixmap(QPixmap(1, 1))
         self.classFlag.setText("")