--- camel-imap-utils.c.orig	2010-08-28 22:13:35.000000000 +1200
+++ camel-imap-utils.c	2010-08-28 22:13:40.000000000 +1200
@@ -917,6 +917,8 @@
 
 		if (g_ascii_strncasecmp (inptr, "nil", 3) != 0) {
 			subtype = imap_parse_string (&inptr, &len);
+			if (inptr == NULL)
+				return NULL;
 		} else {
 			subtype = NULL;
 			inptr += 3;