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is a unique key on null field bad?

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So, we are trying to track down some problems we're having with an implementation of slony on our database. I've posted to the slony list about this issue, but I wanted to get a more generic response from the perspective of postgresql.

Is it a 'bad thing' to have a unique key on a field that is often times null? This application has been running along just fine for a couple of years now, but when we try to implement a slony replication solution, this one table consistently has inconsistent data between the primary node and the slave.

The problem we are having with slony seems to be related to a table that has just such a key, so we are trying to figure out if this is causing the problem.

--
Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
 - Benjamin Franklin

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