500 internal server error in restful api when I send a value as true and works if I send it as false

I am try to call an API but when I send isRestart : true, I get 500 internal server error and when I send the same data with **isRestart: false **, I get a response and status 200, so its working fine on false statement but its giving me 500 error on true statement. any ideas what might be causing it ?

 const resetExam = () => {
const resetExamData = {
  studentId: student_id,
  studentType: student_type,
  isRestart: true,
};
axios
  .post(`https://myapiurl.net/api/getExamList`, resetExamData)
  .then((response) => {
    console.log(response.data.data);
  })
  .catch((error) => {
    console.log(error, "Error Loading Reset APi, Please Try Again !");
  });

};

Note : message : "Creating default object from empty value" // This is what it says in the developer console network tab.