Fixed RB-4138 - json validation on wonky params

app/Rules/ValidJson.php

@@ -4,17 +4,18 @@ namespace App\Rules;
 
 use Closure;
 use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Translation\PotentiallyTranslatedString;
 
 class ValidJson implements ValidationRule
 {
     /**
      * Run the validation rule.
      *
-     * @param  \Closure(string, ?string=): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     * @param  Closure(string, ?string=): PotentiallyTranslatedString  $fail
      */
     public function validate(string $attribute, mixed $value, Closure $fail): void
     {
-        if (!json_validate($value)) {
+        if (! is_string($value) || ! json_validate($value)) {
             $fail(trans('validation.json'));
         }
     }