diff --git a/ext/tcltklib/tcltklib.c b/ext/tcltklib/tcltklib.c
index 12629a423e..ec00cea217 100644
--- a/ext/tcltklib/tcltklib.c
+++ b/ext/tcltklib/tcltklib.c
@@ -1020,7 +1020,7 @@ ip_invoke_real(argc, argv, obj)
 
     /* exception on mainloop */
     if (ptr->return_value == TCL_ERROR) {
-	if (event_loop_abort_on_exc > 0) {
+	if (event_loop_abort_on_exc > 0 && !Tcl_InterpDeleted(ptr->ip)) {
 	    rb_raise(rb_eRuntimeError, "%s", ptr->ip->result);
 	} else {
 	    if (event_loop_abort_on_exc < 0) {
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index 6ee5c36fba..13e41ece44 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -3359,7 +3359,7 @@ class TkObject<TkKernel
   private :tk_trace_variable
 
   def destroy
-    tk_call 'trace', 'vdelete', @tk_vn, 'w', @var_id if defined? @var_id
+    # tk_call 'trace', 'vdelete', @tk_vn, 'w', @var_id if @var_id
   end
 end
 
@@ -3721,10 +3721,21 @@ class TkWindow<TkObject
     self
   end
 
+  def _destroy_children
+    children = []
+    rexp = /^#{self.path}\.[^.]+$/
+    TkCore::INTERP.tk_windows.each{|path, obj|
+      children << obj if path =~ rexp
+    }
+    children.each{|obj| obj.destroy}
+  end
+  private :_destroy_children
+
   def destroy
     super
+    _destroy_children
     tk_call 'destroy', epath
-    if @cmdtbl
+    if defined?(@cmdtbl)
       for id in @cmdtbl
 	uninstall_cmd id
       end
@@ -4959,6 +4970,10 @@ module TkComposite
       @path = @epath = @frame.path
       initialize_composite(*args)
     end
+    unless defined? @delegates
+      @delegates = {} 
+      @delegates['DEFAULT'] = @frame
+    end
   end
 
   def epath
@@ -4969,10 +4984,6 @@ module TkComposite
   private :initialize_composite
 
   def delegate(option, *wins)
-    unless @delegates
-      @delegates = {} 
-      @delegates['DEFAULT'] = @frame
-    end
     if @delegates[option].kind_of?(Array)
       for i in wins
 	@delegates[option].push(i)
@@ -5077,7 +5088,13 @@ end
 # widget_destroy_hook
 require 'tkvirtevent'
 TkBindTag::ALL.bind(TkVirtualEvent.new('Destroy'), proc{|widget| 
-		      if widget.respond_to? :__destroy_hook__
+		      if widget.respond_to?(:path)
+			w = widget.path
+		      else
+			w = widget.to_s
+		      end
+		      if widget.respond_to?(:__destroy_hook__) &&
+			  TkCore::INTERP._invoke('winfo','exist',w) == '1'
 			begin
 			  widget.__destroy_hook__
 			rescue Exception
diff --git a/ext/tk/lib/tkafter.rb b/ext/tk/lib/tkafter.rb
index b24d6c72d3..eddfc16f63 100644
--- a/ext/tk/lib/tkafter.rb
+++ b/ext/tk/lib/tkafter.rb
@@ -34,7 +34,7 @@ class TkTimer
     begin
       ex_obj.cb_call
     rescue Exception
-      Tk_CBTBL[obj_id] = nil
+      ex_obj.cancel
       ""
     end
   end
@@ -143,6 +143,7 @@ class TkTimer
     set_procs(*args) if args != []
 
     @running = false
+    @in_callback = false
   end
 
   attr :after_id
diff --git a/ext/tk/sample/safe-tk.rb b/ext/tk/sample/safe-tk.rb
index 0c45ec3dbd..7050b236eb 100644
--- a/ext/tk/sample/safe-tk.rb
+++ b/ext/tk/sample/safe-tk.rb
@@ -44,10 +44,10 @@ cmd = Proc.new{|txt|
 }
 
 # call on the default master interpreter
-trusted_slave.eval_proc(cmd, 'trusted')
-safe_slave1.eval_proc(cmd, 'safe1')
-safe_slave2.eval_proc(cmd, 'safe2')
-cmd.call('master')
+trusted_slave.eval_proc(cmd, 'trusted')  # label -> .w00012
+safe_slave1.eval_proc(cmd, 'safe1')      # label -> .w00015
+safe_slave2.eval_proc(cmd, 'safe2')      # label -> .w00018
+cmd.call('master')                       # label -> .w00021
 
 TkTimer.new(2000, -1, proc{p ['safe1', safe_slave1.deleted?]}).start
 TkTimer.new(2000, -1, proc{p ['safe2', safe_slave2.deleted?]}).start
@@ -57,6 +57,7 @@ TkTimer.new(10000, 1,
 	    proc{
 	      trusted_slave.eval_proc{Tk.root.destroy}
 	      trusted_slave.delete
+	      print "*** The trusted_slave is deleted by the timer.\n"
 	    }).start
 
 Tk.mainloop