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SYS_GUID not being inserted in PLSQL Expression

Hello,
I have a form in my application to add a row into a lookup table. This is the insert statement contained in the dynamic action that executes a server-side code.
INSERT INTO NON_APPLICATION_ACTIVITY (NON_APPLICATION_ACTIVITY_ID, ACTIVITY_EN_NAME,
ACTIVITY_FR_NAME, ACTIVE_IND, EXPIRY_DATE, EFFECTIVE_DATE, LAST_MODIFIED_DATE, LAST_MODIFIED_USER)
VALUES ((SELECT SYS_GUID() FROM DUAL), :P13_ACTIVITY_EN_NAME, :P13_ACTIVITY_FR_NAME, 1, sysdate, sysdate, sysdate,(SELECT USERNAME
FROM PERSON
WHERE (SELECT NVL ((UPPER (APEX_UTIL.get_username (APEX_UTIL.get_current_user_id))), USER)
FROM SYS.DUAL) = UPPER(USERNAME) ) );
When I click on the button to execute this code, it says it can't insert null into NON_APPLICATION_ACTIVITY_ID. Does anyone know why the statement 'SELECT SYS_GUID() FROM DUAL' would return null in APEX? This work just using PL/SQL Developer.