diff --git a/system-config-printer-cdi-no-drivers.patch b/system-config-printer-cdi-no-drivers.patch
new file mode 100644
index 0000000..b973dfb
--- /dev/null
+++ b/system-config-printer-cdi-no-drivers.patch
@@ -0,0 +1,12 @@
+diff -up system-config-printer-1.2.0/check-device-ids.py.cdi-no-drivers system-config-printer-1.2.0/check-device-ids.py
+--- system-config-printer-1.2.0/check-device-ids.py.cdi-no-drivers	2010-03-17 14:20:35.000000000 +0000
++++ system-config-printer-1.2.0/check-device-ids.py	2010-03-18 16:29:56.065865306 +0000
+@@ -167,7 +167,7 @@ for device, attrs in devices.iteritems (
+     try:
+         drivers = ppds.ids[id_fields['MFG'].lower ()][id_fields['MDL'].lower ()]
+     except KeyError:
+-        drivers = None
++        drivers = []
+ 
+     if i < n:
+         more = unichr (0x2502)
diff --git a/system-config-printer.spec b/system-config-printer.spec
index a705082..25db949 100644
--- a/system-config-printer.spec
+++ b/system-config-printer.spec
@@ -7,7 +7,7 @@
 Summary: A printer administration tool
 Name: system-config-printer
 Version: 1.2.0
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: GPLv2+
 URL: http://cyberelk.net/tim/software/system-config-printer/
 Group: System Environment/Base
@@ -19,6 +19,7 @@ Source2: http://cyberelk.net/tim/data/pysmbc/pysmbc-%{pysmbc_version}.tar.bz2
 
 Patch1: system-config-printer-no-epydoc.patch
 Patch2: system-config-printer-lowercase-mfg-mdl.patch
+Patch3: system-config-printer-cdi-no-drivers.patch
 
 BuildRequires: cups-devel >= 1.2
 BuildRequires: python-devel >= 2.4
@@ -83,6 +84,10 @@ printers.
 # Convert InstallPrinterDriver requests to lower-case.
 %patch2 -p1 -b .lowercase-mfg-mdl
 
+# Fixed traceback in check-driver-ids.py when no drivers are found
+# (bug #574827).
+%patch3 -p1 -b .cdi-no-drivers
+
 %build
 %configure --with-udev-rules
 
@@ -198,6 +203,10 @@ rm -rf %buildroot
 exit 0
 
 %changelog
+* Thu Mar 18 2010 Tim Waugh <twaugh@redhat.com> - 1.2.0-2
+- Fixed traceback in check-driver-ids.py when no drivers are found
+  (bug #574827).
+
 * Wed Mar 17 2010 Tim Waugh <twaugh@redhat.com> - 1.2.0-1
 - Updated to pycups-1.9.49.
 - 1.2.0: