diff -u ams-2.0.1/debian/control ams-2.0.1/debian/control
--- ams-2.0.1/debian/control
+++ ams-2.0.1/debian/control
@@ -1,7 +1,8 @@
 Source: ams
 Section: sound
 Priority: optional
-Maintainer: Debian Multimedia Maintainers <pkg-multimedia-maintainers@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Multimedia Maintainers <pkg-multimedia-maintainers@lists.alioth.debian.org>
 Uploaders: Free Ekanayaka <freee@debian.org>,
  Junichi Uekawa <dancer@debian.org>,
  Alessio Treglia <quadrispro@ubuntu.com>
diff -u ams-2.0.1/debian/changelog ams-2.0.1/debian/changelog
--- ams-2.0.1/debian/changelog
+++ ams-2.0.1/debian/changelog
@@ -1,3 +1,10 @@
+ams (2.0.1-3ubuntu0.1) maverick-proposed; urgency=low
+
+  * Fix crash when jack_handle is NULL (LP: #553366);
+    patch backported from natty.
+
+ -- Alessio Treglia <quadrispro@ubuntu.com>  Tue, 26 Oct 2010 10:55:56 +0200
+
 ams (2.0.1-3build1) maverick; urgency=low
 
   * No-change rebuild due to jackd -> jackd2 transition.
diff -u ams-2.0.1/debian/patches/series ams-2.0.1/debian/patches/series
--- ams-2.0.1/debian/patches/series
+++ ams-2.0.1/debian/patches/series
@@ -2,0 +3 @@
+03-null_jack_handle.patch
only in patch2:
unchanged:
--- ams-2.0.1.orig/debian/patches/03-null_jack_handle.patch
+++ ams-2.0.1/debian/patches/03-null_jack_handle.patch
@@ -0,0 +1,21 @@
+Subject: Prevent crash if jack handle is NULL.
+Origin: backport, commit:1.2
+Bug: http://sourceforge.net/support/tracker.php?aid=2987034
+Bug-Ubuntu: https://launchpad.net/bugs/553366
+Applied-Upstream: commit:1.2
+---
+ src/synthdata.cpp |    3 +++
+ 1 file changed, 3 insertions(+)
+
+--- ams.orig/src/synthdata.cpp
++++ ams/src/synthdata.cpp
+@@ -532,6 +532,9 @@ int SynthData::initJack (int ncapt, int
+ 
+ int SynthData::closeJack ()
+ {
++    if (jack_handle == NULL) {
++        return 0;
++    }
+     qWarning(QObject::tr("Closing JACK...").toUtf8());
+     jack_deactivate (jack_handle);
+     for (int i = 0; i < play_ports; i++)