Oracle : Ошибка ORA-22908


"reference to NULL table value"
*Cause: The evaluation of the THE subquery or nested table column
resulted in a NULL value implying a NULL table instance.
The THE subquery or nested table column must identify a
single non-NULL table instance.
*Action: Ensure that the evaluation of the THE subquery or nested table
column results in a single non-null table instance. If happening
in the context of an insert statement where the THE subquery is
the target of an insert, then ensure that an empty nested table
instance is created by updating the nested table column of the
parent table's row specifying an empty nested table constructor.

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