diff --git a/composer.json b/composer.json
index c91da6c..2bcea88 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "fleetbase/core-api",
-    "version": "1.1.2-alpha",
+    "version": "1.1.3-alpha",
     "description": "Core Framework and Resources for Fleetbase API",
     "keywords": [
         "fleetbase",
diff --git a/src/Casts/PolymorphicType.php b/src/Casts/PolymorphicType.php
index bed92a9..c031848 100644
--- a/src/Casts/PolymorphicType.php
+++ b/src/Casts/PolymorphicType.php
@@ -32,7 +32,12 @@ public function get($model, $key, $value, $attributes)
      */
     public function set($model, $key, $value, $attributes)
     {
-        $className = Utils::getMutationType($value);
+        // default $className is null
+        $className = null;
+
+        if ($value) {
+            $className = Utils::getMutationType($value);
+        }
 
         return $className;
     }
diff --git a/src/Support/Utils.php b/src/Support/Utils.php
index a9441bb..bb7e7ba 100644
--- a/src/Support/Utils.php
+++ b/src/Support/Utils.php
@@ -76,11 +76,10 @@ public static function consoleUrl(string $path, ?array $queryParams = null, $sub
      */
     public static function fromS3(string $path, $bucket = null, $region = null): string
     {
-        $bucket = $bucket ?? config('filesystems.disks.s3.bucket');
-        $region = $region ?? config('filesystems.disks.s3.region');
+        $bucket = $bucket ?? config('filesystems.disks.s3.bucket', $bucket);
+        $region = $region ?? config('filesystems.disks.s3.region', $region);
 
         return 'https://' . $bucket . '.s3-' . $region . '.amazonaws.com/' . $path;
-        // return 'https://s3.' . $region . '.amazonaws.com/' . $bucket . '/' . $path;
     }
 
     /**
@@ -90,9 +89,21 @@ public static function fromS3(string $path, $bucket = null, $region = null): str
      * @param string $pattern
      * @return boolean
      */
-    public static function assetFromS3(string $path): string
+    public static function assetFromS3(string $path, $region = null): string
     {
-        return static::fromS3($path, 'flb-assets');
+        return static::fromS3($path, 'flb-assets', $region);
+    }
+
+    /**
+     * Return asset URL from Fleetbase S3 asset bucket.
+     *
+     * @param string $string
+     * @param string $pattern
+     * @return boolean
+     */
+    public static function assetFromFleetbase(string $path): string
+    {
+        return static::assetFromS3($path, 'ap-southeast-1');
     }
 
     /**
diff --git a/src/Traits/HasApiModelBehavior.php b/src/Traits/HasApiModelBehavior.php
index d37d108..0d82fdf 100644
--- a/src/Traits/HasApiModelBehavior.php
+++ b/src/Traits/HasApiModelBehavior.php
@@ -942,7 +942,8 @@ public function isInvalidUpdateParam(string $key): bool
         $isNotRelation = !$this->isRelation($key) && !$this->isRelation(Str::camel($key));
         $isNotFilterParam = !$this->isFilterParam($key);
         $isNotAppenededAttribute = !in_array($key, $this->appends ?? []);
+        $isNotIdParam = !in_array($key, ['id', 'uuid', 'public_id']);
 
-        return $isNotTimestamp && $isNotFillable && $isNotRelation && $isNotFilterParam && $isNotAppenededAttribute;
+        return $isNotTimestamp && $isNotFillable && $isNotRelation && $isNotFilterParam && $isNotAppenededAttribute && $isNotIdParam;
     }
 }