-309 A PREDICATE IS INVALID BECAUSE A REFERENCED HOST VARIABLE HAS THE NULL VALUE

Explanation
 The statement could not be processed because a
host variable appearing in a predicate such as  column-name = host-variable
 had
the NULL value. Such a predicate is not permitted when the host variable
contains the NULL value even though the object column might contain
nulls.

System action
 The statement cannot be processed.

Programmer response
 Rebind the plan or package containing the statement. The condition described is not an error in
Version 2 Release 3 and later DB2®
releases.

SQLSTATE
 22512 