diff --git a/ide/fpdochints.pas b/ide/fpdochints.pas
index e7f5dcdbaa..dcba1d217a 100644
--- a/ide/fpdochints.pas
+++ b/ide/fpdochints.pas
@@ -214,6 +214,7 @@ begin
   // important: free provider before control
   FreeAndNil(FHTMLProvider);
   FreeAndNil(FTextControl);
+  FreeAndNil(FHTMLControl);
   WaitingForIdle:=false;
   inherited Destroy;
 end;