--- slot_collision.py	2010-09-05 14:15:42.994958137 +0100
+++ /usr/lib64/portage/pym/_emerge/resolver/slot_collision.py	2010-09-05 14:16:39.891970150 +0100
@@ -291,7 +291,7 @@
                                                         if slot:
                                                                 atom_str = atom_str.replace(":" + slot, colorize("BAD", ":" + slot))
                                                 
-                                                if use and atom.use.tokens:
+                                                if use and atom.use and atom.use.tokens:
                                                         use_part_start = atom_str.find("[")
                                                         use_part_end = atom_str.find("]")