--- 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;
 			}