From 1ce3d33d83524a31b8357802602059f975e66851 Mon Sep 17 00:00:00 2001
From: alexs75 <alexs75@8e941d3f-bd1b-0410-a28a-d453659cc2b4>
Date: Sun, 29 Jan 2012 17:50:00 +0000
Subject: [PATCH] fix TRxHistoryNavigator with empty Back or Forward buttons

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@2273 8e941d3f-bd1b-0410-a28a-d453659cc2b4
---
 components/rx/rxhistorynavigator.pas | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/components/rx/rxhistorynavigator.pas b/components/rx/rxhistorynavigator.pas
index b1ca0f49a..1ed51a173 100644
--- a/components/rx/rxhistorynavigator.pas
+++ b/components/rx/rxhistorynavigator.pas
@@ -190,8 +190,14 @@ end;
 procedure TRxHistoryNavigator.EnableAction(ActName: byte; Enable: boolean);
 begin
   if First=nil then Enable:=false;
-  if ActName = 0 then (FBackBtnItem.Action as TAction).Enabled:=Enable
-  else (FForwardBtnItem.Action as TAction).Enabled:=Enable
+  if ActName = 0 then
+  begin
+    if Assigned(FBackBtnItem) then
+      (FBackBtnItem.Action as TAction).Enabled:=Enable
+  end
+  else
+    if Assigned(FForwardBtnItem) then
+      (FForwardBtnItem.Action as TAction).Enabled:=Enable
 end;
 
 procedure TRxHistoryNavigator.BackProc(Sender: TObject);