Why am I getting an error on response.json() on Mozila?

Question

JavaScript

Good afternoon.

function queryToServer(type, numDay)
  {
    return fetch('/admin_test/api.php', {
          method: "POST",
          headers: {
              'Content-Type': 'application/json',
              'Accept': 'application/x-www-form-urlencoded;charset=UTF-8'
          },
          body: JSON.stringify({type: type, day: numDay})
      })
    .then((response) => {
        console.log(response)
              return response.json();
          })
      .then((data) => {
      return data;
    	})
    	.catch((error) => {
      	console.log(error);
   	})
  }

Here is the response from networks browser

[{"order_status":"\u041e\u0436\u0438\u0434\u0430\u0435\u0442 \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u044f","number_status":"1"},{"order_status":"\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d","number_status":"22"}]

Google chrome

Mozila


Error in Mozila

SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

Help me figure it out please