emerge broken after emerge system -up ?

[linux4u1]

this is not on an install this is after updateding a fulling working system when trying to emerge world -up i get this response can someone please help thanks . this is after emerge system -up

emerge world -p -u

These are the packages that I would merge, in order.

Calculating world dependencies \Traceback (most recent call last):
File "/usr/bin/emerge", line 1227, in ?
if not mydepgraph.syscreate(getworldlist()):
File "/usr/bin/emerge", line 513, in syscreate
if not self.create(self.match(myline,mykey="update (likely old /var/db/pkg entry)")):
File "/usr/bin/emerge", line 466, in create
if not self.create(mynew,mybigkey):
File "/usr/bin/emerge", line 410, in create
edepend=portage.db[myroot]["porttree"].dbapi.aux_get(mykey,portage.auxdbkeys)
File "/usr/lib/python2.2/site-packages/portage.py", line 2565, in aux_get
self.auxcache[mycpv][auxdbkeys[x]]=mylines[x][:-1]
IndexError: list index out of range
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[delta407]

That's a Portage bug. Wait for the next version.