Issue is reported on user list: http://apache-ignite-users.70518.x6.nabble.com/Problem-with-Visor-and-Cassandra-Cache-Store-td15076.html
There is an obvious bug in the code. VisorCacheJdbcType#list method checks the type of store factory like this:
It should be && instead of ||, because otherwise condition will be true for any factory that is not null. Even better if factory != null is removed completely as instanceof returns false for null values anyway.
However, it's not clear to me why this scenario is reproduced only in certain conditions (see mailing list thread for details). It's possible that there is another hidden bug, this needs to be investigated.