Fix based on suggested #517 (comment)

Author: keatliang2005

src/Traits/HasWallet.php

@@ -81,7 +81,7 @@ public function getBalanceIntAttribute(): int
     public function walletTransactions(): HasMany
     {
         return app(CastServiceInterface::class)
-            ->getWallet($this, !is_null($this->id))
+            ->getWallet($this, false)
             ->hasMany(config('wallet.transaction.model', Transaction::class), 'wallet_id')
         ;
     }