Because of some changes in the virtualtree the result of inherited DoGetImageIndex(Node, Kind, Column, Ghosted, Index) will never be nil.

Author: Roman Kassebaum

Source/VirtualExplorerTree.pas

@@ -4280,7 +4280,7 @@ function TCustomVirtualExplorerTree.DoGetImageIndex(Node: PVirtualNode; Kind: TV
 
   if ValidateNamespace(Node, NS) then
   begin
-    if (Result = nil) and (Column = Header.MainColumn) then
+    if Column = Header.MainColumn then
     begin
       Result := Images;
       if Result = nil then