I upgraded my Traveler server to latest 9.0.1.15 from 9.0.1.13

After upgrading, I see one warning during start:

Traveler: WARNING *system Exception caught trying to create constraint PK_INVMAP on Table INV_MAP. Exception Thrown: com.lotus.sync.db.PersistenceException: java.sql.SQLSyntaxErrorException: 'DEVUID' cannot be a column of a primary key or unique key because it can contain null

I use built-in Derby database.

I know, that I should check status of upgraded tables using new command 'tell traveler tablerepair show *', but this command says, what all OK

[0A80:0028-1804] 11/21/2016 02:26:54 PM  Traveler: GUIDMAP table is repaired.
[0A80:0028-1804] 11/21/2016 02:26:54 PM  Traveler: TS_FILTERS table is repaired.
[0A80:0028-1804] 11/21/2016 02:26:54 PM  Traveler: PUSH table is repaired.
[0A80:0028-1804] 11/21/2016 02:26:54 PM  Traveler: REPLICAS table is repaired.

As I can see, 'traveler tablerepair' command don't know anything about INV_MAP table.

Should I take further actions, although

Traveler: The overall status of IBM Traveler is Green.

?