Multiple values for CurrentLocal Node ID

From this email thread http://www.mail-archive.com/user@cassandra.apache.org/msg24677.html

There are multiple columns for the CurrentLocal row in NodeIdInfo:

[default@system] list NodeIdInfo ;
Using default limit of 100
...
-------------------
RowKey: 43757272656e744c6f63616c
=> (column=01efa5d0-e133-11e1-0000-51be601cd0ff, value=0a1020d2, timestamp=1344414498989)
=> (column=92109b80-ea0a-11e1-0000-51be601cd0af, value=0a1020d2, timestamp=1345386691897)

SystemTable.getCurrentLocalNodeId() throws an assertion that occurs when the static constructor for o.a.c.utils.NodeId is in the stack.

The impact is a java.lang.NoClassDefFoundError when accessing a particular CF (I assume on with counters) on a particular node.

Cannot see an obvious cause in the code.