Index: components/tachart/tagraph.pas
===================================================================
--- components/tachart/tagraph.pas	(revision 55952)
+++ components/tachart/tagraph.pas	(working copy)
@@ -688,6 +688,8 @@
   FMargins := TChartMargins.Create(Self);
   FMarginsExternal := TChartMargins.Create(Self);
 
+  if not Assigned(OnInitBuiltinTools) then
+    raise Exception.Create('No BasicChartToolset defined!');
   FBuiltinToolset := OnInitBuiltinTools(Self);
   FActiveToolIndex := -1;