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The Session Protection Error in Oracle APEX 21.2 occurs when a disabled textfield is loaded through a dynamic action because the browser fails to submit the disabled item's value to the server, which causes a mismatch between the session state and the database state. As a result, the session is invalidated, and the user is prompted with the Session Protection Error message. To avoid this error, you should remove the disabled attribute from the textfield and use a read-only attribute instead.