Segmentation fault in callback remove function.

[ritugoel]

Below given code results in segmentation fault. Result is displayed beneath the code

import esdl;
import uvm;
class TestBench: RootEntity
{ uvm_root_entity!(test_root) tb; }
class test_root:uvm_root
{ mixin uvm_component_utils; }
class my_catcher: uvm_report_catcher
{ static int seen = 0;
override action_e do_catch()
{ import std.stdio;
writeln("Caught a message...\n");
seen++;
return CAUGHT; } }
class test: uvm_test
{bool pass = 1;
my_catcher ctchr ;
my_catcher ctchr1 ;
my_catcher ctchr2 ;
my_catcher ctchr3;
mixin uvm_component_utils;
this(string name, uvm_component parent = null)
{super(name, parent);
my_catcher ctchr = new my_catcher;
my_catcher ctchr1 = new my_catcher;
my_catcher ctchr2 = new my_catcher;
my_catcher ctchr3= new my_catcher; }
override void run()
{import std.stdio;
writeln("UVM TEST - WARNING expected since re_registering a default catcher\n");
//add_report_default_catcher(ctchr, UVM_APPEND);
uvm_report_cb.add(null,ctchr);
uvm_report_cb.add(null,ctchr);
writeln("now remove");
uvm_report_cb.remove(null,ctchr);
uvm_top.stop_request();}
override void report()
{ import std.stdio;
writeln("** UVM TEST PASSED **\n"); } }
void main( string[] argv)
{
TestBench tb = new TestBench;
tb.multiCore(0, 0);
tb.elaborate("test", argv);
tb.simulate();
}
Result:

Starting Phase: BUILD

UVM-1.1d
(C) 2007-2013 Mentor Graphics Corporation
(C) 2007-2013 Cadence Design Systems, Inc.
(C) 2006-2013 Synopsys, Inc.
(C) 2011-2013 Cypress Semiconductor Corp.

(C) 2012-2015 Coverify Systems Technology

Starting Phase: CONFIGURE
********** No default timePrecision specified; setting timePrecision to 1.psec
********** No default timeUnit specified; setting timeUnit to 1.nsec
Starting Phase: BIND
Start of Simulation
UVM_INFO @ #0: reporter [RNTST] Running test test (via factory override for test "test.test")...
UVM TEST - WARNING expected since re_registering a default catcher

UVM_ERROR @ #0: reporter [CBUNREG] Null callback object cannot be registered with object () (uvm_report_object)
UVM_ERROR @ #0: reporter [CBUNREG] Null callback object cannot be registered with object () (uvm_report_object)
now remove
Segmentation fault (core dumped)
Kindly resolve this issue.
Regards,
-Ritu