@@ -53,10 +53,13 @@
 
 bool
 class_conformsToProtocol(Class cls, Protocol *p)
 {
 	struct objc_category **cats;
+
+	if (cls == Nil)
+		return false;
 
 	for (struct objc_protocol_list *pl = cls->protocols;
 	    pl != NULL; pl = pl->next)
 		for (long i = 0; i < pl->count; i++)
 			if (protocol_conformsToProtocol(pl->list[i], p))