Fix https://github.com/firefly-iii/firefly-iii/issues/6260

app/Models/BudgetLimit.php

@@ -24,6 +24,7 @@ namespace FireflyIII\Models;
 
 use Eloquent;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Support\Carbon;
@@ -119,4 +120,16 @@ class BudgetLimit extends Model
     {
         return $this->belongsTo(TransactionCurrency::class);
     }
+
+    /**
+     * Get the amount
+     *
+     * @return Attribute
+     */
+    protected function amount(): Attribute
+    {
+        return Attribute::make(
+            get: fn($value) => (string) $value,
+        );
+    }
 }