[Vuejs]-(in promise) TypeError: Cannot read property '0' of null

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your check_permissions is having the state: prompt so the code will not go into your if block here

if (check_permissions.state === "granted") { //<------------------- false
        this.error_flag = false;
        this.error_message = "";

        if (navigator.geolocation) {
          navigator.geolocation.getCurrentPosition(this.showPosition); //<--- why not passing a param here? your function showPosition await a parameter

          this.error_flag = false;
          this.error_message = "";
        } else {
          this.error_flag = true;
          this.error_message = "Perangkat anda tidak mendukung GPS";
        }
      } else // <---------- your landing here
        this.error_flag = true;
        this.error_message = "Silahkan aktifkan GPS terlebih dahulu";
      }

then your code ends.

there is btw no need to await a synchronous function like here

                  // no need to await since navigator.permission is not async at all
const check_permissions = await navigator.permissions.query({
        name: "geolocation",
      });

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