ORA-22908: reference to NULL table value

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ORA-22908: reference to NULL table value..

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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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