diff --git a/evolution-2.10.1-calendar-component.patch b/evolution-2.10.1-calendar-component.patch
new file mode 100644
index 0000000..59982b5
--- /dev/null
+++ b/evolution-2.10.1-calendar-component.patch
@@ -0,0 +1,17 @@
+--- evolution-2.10.1/calendar/gui/calendar-component.c.calendar-component	2007-05-07 14:07:16.000000000 -0400
++++ evolution-2.10.1/calendar/gui/calendar-component.c	2007-05-07 14:11:48.000000000 -0400
+@@ -210,7 +210,13 @@
+ 		GSList *s;
+ 		for (s = sources; s; s = s->next) {
+ 			ESource *source = E_SOURCE (s->data);
+-			if (!strcmp (PERSONAL_RELATIVE_URI, e_source_peek_relative_uri (source))) {
++			const gchar *relative_uri;
++
++			g_assert (source != NULL);
++			relative_uri = e_source_peek_relative_uri (source);
++			if (relative_uri == NULL)
++				continue;
++			if (!strcmp (PERSONAL_RELATIVE_URI, relative_uri)) {
+ 				personal_source = source;
+ 				break;
+ 			}
diff --git a/evolution.spec b/evolution.spec
index ed804a5..02d94b4 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -47,7 +47,7 @@
 
 Name: evolution
 Version: 2.10.1
-Release: 12%{?dist}
+Release: 13%{?dist}
 License: GPL
 Group: Applications/Productivity
 Summary: GNOME's next-generation groupware suite
@@ -173,6 +173,9 @@ Patch51: evolution-2.10.1-en_CA-attribution-format.patch
 # RH bug #238551 / GNOME bug #434981
 Patch52: evolution-2.10.1-e-attachment-bar.patch
 
+# RH bug #238155 / GNOME bug #427232
+Patch53: evolution-2.10.1-calendar-component.patch
+
 ## Dependencies ###
 
 Requires(post): GConf2
@@ -330,6 +333,7 @@ Development files needed for building things which link against evolution.
 %patch50 -p1 -b .fix-uri-handling
 %patch51 -p1 -b .en_CA-attribution-format
 %patch52 -p1 -b .e-attachment-bar
+%patch53 -p1 -b .calendar-component
 
 mkdir -p krb5-fakeprefix/include
 mkdir -p krb5-fakeprefix/lib
@@ -751,6 +755,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_libdir}/evolution/%{evo_major}/libmenus.so
 
 %changelog
+* Mon May 07 2007 Matthew Barnes <mbarnes@redhat.com> - 2.10.1-13.fc7
+- Add patch for RH bug #238155 (crash on startup).
+
 * Tue May 01 2007 Matthew Barnes <mbarnes@redhat.com> - 2.10.1-12.fc7
 - Add patch for RH bug #238551 (incorrect attachment count).