Fix (must not be accessed before initialization)?

[UnknownNull]

Error: Typed property sergittos\bedwars\session\Session::$coins must not be accessed before initialization
File: plugins/BedWars-master/src/sergittos/bedwars/session/Session
Line: 144

[142]     public function getCoins(): int
[143]     {
[144]         return $this->coins;
[145]     }

[Sergittos]

Thanks!