diff --git a/system-config-printer-asyncipp-traceback.patch b/system-config-printer-asyncipp-traceback.patch
new file mode 100644
index 0000000..e33232f
--- /dev/null
+++ b/system-config-printer-asyncipp-traceback.patch
@@ -0,0 +1,31 @@
+diff -up system-config-printer-1.2.0/asyncipp.py.asyncipp-traceback system-config-printer-1.2.0/asyncipp.py
+--- system-config-printer-1.2.0/asyncipp.py.asyncipp-traceback	2010-03-25 16:36:02.264236367 +0000
++++ system-config-printer-1.2.0/asyncipp.py	2010-03-25 16:36:08.558237409 +0000
+@@ -189,20 +189,20 @@ class _IPPConnectionThread(threading.Thr
+ 
+     def _reply (self, result):
+         def send_reply (result):
+-            self._reply_handler (self._conn, result)
++            if self._reply_handler:
++                self._reply_handler (self._conn, result)
+             return False
+ 
+-        if self._reply_handler:
+-            gobject.idle_add (send_reply, result)
++        gobject.idle_add (send_reply, result)
+ 
+     def _error (self, exc):
+         def send_error (exc):
+-            self._error_handler (self._conn, exc)
++            if self._error_handler:
++                self._error_handler (self._conn, exc)
+             return False
+ 
+-        if self._error_handler:
+-            debugprint ("Add %s to idle" % self._error_handler)
+-            gobject.idle_add (send_error, exc)
++        debugprint ("Add %s to idle" % self._error_handler)
++        gobject.idle_add (send_error, exc)
+ 
+ ###
+ ### This is the user-visible class.  Although it does not inherit from
diff --git a/system-config-printer.spec b/system-config-printer.spec
index 78337b1..848dd90 100644
--- a/system-config-printer.spec
+++ b/system-config-printer.spec
@@ -28,6 +28,7 @@ Patch8: system-config-printer-downloadable-drivers.patch
 Patch9: system-config-printer-JobCancel.patch
 Patch10: system-config-printer-inklevel.patch
 Patch11: system-config-printer-cdi-search-harder.patch
+Patch12: system-config-printer-asyncipp-traceback.patch
 
 Patch100: system-config-printer-pycups-build.patch
 
@@ -122,6 +123,9 @@ printers.
 # check-device-ids: search harder for missing Device IDs.
 %patch11 -p1 -b .cdi-search-harder
 
+# Fixed traceback in asyncipp (bug #576932).
+%patch12 -p1 -b .cdi-search-harder
+
 pushd pycups-%{pycups_version}
 
 # Fixed pycups build with new distutils.
@@ -245,6 +249,7 @@ exit 0
 
 %changelog
 * Thu Mar 25 2010 Tim Waugh <twaugh@redhat.com> - 1.2.0-8
+- Fixed traceback in asyncipp (bug #576932).
 - check-device-ids: search harder for missing Device IDs.
 - Make inklevel widget easier to read (bug #576930).