diff -r b95c957c50ec -r b31fca4f6f60 libpurple/protocols/yahoo/yahoo.c
--- a/libpurple/protocols/yahoo/yahoo.c	Fri Apr 27 14:37:15 2007 +0000
+++ b/libpurple/protocols/yahoo/yahoo.c	Fri Apr 27 22:44:46 2007 +0000
@@ -345,6 +345,7 @@
 			/* FIXME: Please, if you know this protocol,
 			 * FIXME: fix up the strtol() stuff if possible. */
 			int cksum = strtol(pair->value, NULL, 10);
+			const char *locksum = NULL;
 			PurpleBuddy *b;
 
 			if (!name)
@@ -363,7 +364,8 @@
 				break;
 
 			yahoo_friend_set_buddy_icon_need_request(f, FALSE);
-			if (b && cksum != strtol(purple_buddy_icons_get_checksum_for_user(b), NULL, 10))
+			if (b && (locksum = purple_buddy_icons_get_checksum_for_user(b)) != NULL &&
+					cksum != strtol(locksum, NULL, 10))
 				yahoo_send_picture_request(gc, name);
 
 			break;