Find error-ed column name in Oracle not null constraint

Question

I have a table with multiple NOT NULL columns. When I insert data with NULL value in NOT NULL columns, NOT NULL constraint error ORA-01400 is raised, but Column name in error message is blank.

ORA-01400: cannot insert NULL into ()

Why I cannot see error-ed column name and What can be work around to get column name in error message as below?

ORA-01400: cannot insert NULL into ("APPS"."MY_TABLE_NAME"."FIRST_NAME")

Table Example :

create table apps.my_table_data
(
  id  number,
  first_name varchar2(50) not null,
  last_name varchar2(50) not null,
  district_name varchar2(50) not null
);

I also tried giving constraint explicit name:

create table apps.my_table_data
(
  id number,
  first_name varchar2(50) constraint my_table_date_first_name not null,
  last_name varchar2(50) constraint my_table_date_last_name not null,
  district_name varchar2(50) constraint my_table_date_district_nm not null
  status  varchar2(30 char),
)

But still I cannot see error-ed column name in error message.