diff --git a/docs/changelog/7.x.x.txt b/docs/changelog/7.x.x.txt
index 7c517c2d6..f0ac4b9d4 100644
--- a/docs/changelog/7.x.x.txt
+++ b/docs/changelog/7.x.x.txt
@@ -1,5 +1,6 @@
 7.10.18
  - fixed #12141: Macro_RenderThingData (bad tags) nothing to translate
+ - fixed #12142: Copy fails on imported threads
 
 7.10.17
  - fixed: Forced to use a PayDriver even with a balance of 0 in the cart.
diff --git a/lib/WebGUI/Asset/Post/Thread.pm b/lib/WebGUI/Asset/Post/Thread.pm
index 0a764964f..3b3bfb40d 100644
--- a/lib/WebGUI/Asset/Post/Thread.pm
+++ b/lib/WebGUI/Asset/Post/Thread.pm
@@ -265,14 +265,18 @@ Extends the base method to handle creating a new subscription group.
 =cut
 
 sub duplicate {
-	my $self    = shift;
-    my $session = $self->session;
-	my $copy    = $self->SUPER::duplicate(@_);
-    if ($self->get('subscriptionGroupId')) {
-        my $group        = WebGUI::Group->new($session, $self->get('subscriptionGroupId'));
-        my $copied_group = WebGUI::Group->new($session, 'new');
-        $copied_group->addUsers($group->getUsers('withoutExpired'));
-        $copy->update({subscriptionGroupId => $copied_group->getId});
+    my $self       = shift;
+    my $session    = $self->session;
+    my $copy       = $self->SUPER::duplicate(@_);
+    my $oldGroupId = $self->get('subscriptionGroupId');
+
+    if ($oldGroupId) {
+        my $newGroup = WebGUI::Group->new($session, 'new');
+        my $oldGroup = WebGUI::Group->new($session, $oldGroupId);
+        if ($oldGroup) {
+            $newGroup->addUsers($oldGroup->getUsers('withoutExpired'));
+        }
+        $copy->update({subscriptionGroupId => $newGroup->getId});
     }
     return $copy;
 }
diff --git a/t/Asset/Post/Thread/bug_12142_duplicate.t b/t/Asset/Post/Thread/bug_12142_duplicate.t
new file mode 100644
index 000000000..9149aa110
--- /dev/null
+++ b/t/Asset/Post/Thread/bug_12142_duplicate.t
@@ -0,0 +1,48 @@
+# vim:syntax=perl
+#-------------------------------------------------------------------
+# WebGUI is Copyright 2001-2009 Plain Black Corporation.
+#-------------------------------------------------------------------
+# Please read the legal notices (docs/legal.txt) and the license
+# (docs/license.txt) that came with this distribution before using
+# this software.
+#------------------------------------------------------------------
+# http://www.plainblack.com                     info@plainblack.com
+#------------------------------------------------------------------
+
+=head1 BUG DESCRIPTION
+
+Thread's duplicate method fails if the subscriptionGroupId isn't a valid group
+(for instance, if it was imported from another site). It should just not copy
+the group in that case.
+
+=cut
+
+use warnings;
+use strict;
+
+use Test::More tests => 4;
+use Test::Exception;
+use FindBin;
+
+use lib "$FindBin::Bin/../lib";
+use WebGUI::Test;
+use WebGUI::Asset;
+
+my $session = WebGUI::Test->session;
+my $thread  = WebGUI::Asset->getImportNode($session)->addChild(
+    {
+        className => 'WebGUI::Asset::Post::Thread',
+        subscriptionGroupId => $session->id->generate(),
+    }
+);
+WebGUI::Test->addToCleanup($thread);
+
+SKIP: {
+    my $copy;
+    skip('duplicate died', 3) unless
+        lives_ok { $copy = $thread->duplicate() } q"duplicate() doesn't die";
+    my $groupId = $copy->get('subscriptionGroupId');
+    ok $groupId, 'Copy has a group id';
+    isnt $groupId, $thread->get('subscriptionGroupId'), '...a different one';
+    ok(WebGUI::Group->new($session, $groupId), '...and it instantiates');
+};
diff --git a/t/_bug.skeleton b/t/_bug.skeleton
new file mode 100644
index 000000000..90f129230
--- /dev/null
+++ b/t/_bug.skeleton
@@ -0,0 +1,32 @@
+# vim:syntax=perl
+#-------------------------------------------------------------------
+# WebGUI is Copyright 2001-2009 Plain Black Corporation.
+#-------------------------------------------------------------------
+# Please read the legal notices (docs/legal.txt) and the license
+# (docs/license.txt) that came with this distribution before using
+# this software.
+#------------------------------------------------------------------
+# http://www.plainblack.com                     info@plainblack.com
+#------------------------------------------------------------------
+
+=head1 BUG DESCRIPTION
+
+Blah blah blah, whatever the bug poster said in the initial post plus any
+relevant clarification from the discussion thread.
+
+=cut
+
+use warnings;
+use strict;
+
+use Test::More tests => 0;
+use FindBin;
+
+use lib "$FindBin::Bin/../lib";
+use WebGUI::Test;
+
+my $session = WebGUI::Test->session;
+
+# A bug test should test the bug it is named for and be placed in an
+# appropriate place in the test tree. For example, if bug #34721 was a Snippet
+# bug, it would go in t/Asset/Snippet/bug_34721_short_description.t.