IdentityService createGroup creates duplicate groups

Repeatedly calling createGroup with the same group name causes very similar records to be entered into the JBPM_ID_GROUP table. They differ only bythe DBID_ field value. Here is an example of what I found in the database.

17 0 another another (null) (null)
18 0 another another (null) (null)
19 0 another another (null) (null)
20 0 another another (null) (null)
21 0 another another (null) (null)

Retrievals don't result in duplicates, but this seems like it might cause problems.