diff --git a/src/Contexts/TypeContext.php b/src/Contexts/TypeContext.php
index 4e502a1..083ceb9 100644
--- a/src/Contexts/TypeContext.php
+++ b/src/Contexts/TypeContext.php
@@ -109,7 +109,7 @@ public static function getInstances(PropertyContext $property): array
                     );
                     break;
                 default:
-                    throw UnsupportedTypeException::unknownType($type);
+                    $instances[] = new static(Type::MIXED);
             }
         }
 
diff --git a/src/Enums/Property/Type.php b/src/Enums/Property/Type.php
index 3953d28..0ed8b95 100644
--- a/src/Enums/Property/Type.php
+++ b/src/Enums/Property/Type.php
@@ -12,6 +12,7 @@ enum Type: string
     case DATETIME = 'datetime';
     case DATA = 'data';
     case ARRAY = 'array';
+    case MIXED = 'mixed';
 
     /** @var list<Type> */
     public const array SCALAR_TYPES = [
diff --git a/src/Exceptions/UnsupportedTypeException.php b/src/Exceptions/UnsupportedTypeException.php
index 9604b18..52aeca1 100644
--- a/src/Exceptions/UnsupportedTypeException.php
+++ b/src/Exceptions/UnsupportedTypeException.php
@@ -6,22 +6,14 @@
 
 class UnsupportedTypeException extends Exception
 {
-    protected const int UNKNOWN_TYPE = 0;
     protected const int EMPTY_TYPE = 1;
     protected const int INVALID_REFLECTION = 2;
-    protected const int INVALID_TYPE = 3;
-
-    public static function unknownType(?string $type = null): self
-    {
-        return new self(
-            'Unknown type' . ($type ? " '{$type}'" : ''),
-        );
-    }
 
     public static function emptyType(): self
     {
         return new self(
             'Got empty type',
+            self::EMPTY_TYPE
         );
     }
 
@@ -29,13 +21,7 @@ public static function invalidReflection(): self
     {
         return new self(
             'Invalid reflection for type',
-        );
-    }
-
-    public static function invalidType(): self
-    {
-        return new self(
-            'Invalid type',
+            self::INVALID_REFLECTION
         );
     }
 }
diff --git a/src/Serializers/DataSerializer.php b/src/Serializers/DataSerializer.php
index 547c50e..99500bc 100644
--- a/src/Serializers/DataSerializer.php
+++ b/src/Serializers/DataSerializer.php
@@ -32,7 +32,7 @@ public static function supportedTypes(): array
     protected function serializeItem(mixed $item, PropertyContext $property, object $object): ?array
     {
         return match (true) {
-            $item === null && $property->isNullable => null,
+            is_null($item) && $property->isNullable => null,
 
             $item instanceof BaseDataContract => $item->jsonSerialize(),
 
diff --git a/src/Serializers/MixedDataSerializer.php b/src/Serializers/MixedDataSerializer.php
new file mode 100644
index 0000000..1856a0a
--- /dev/null
+++ b/src/Serializers/MixedDataSerializer.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Nuxtifyts\PhpDto\Serializers;
+
+use Nuxtifyts\PhpDto\Contracts\SerializesArrayOfItems as SerializesArrayOfItemsContract;
+use Nuxtifyts\PhpDto\Concerns\SerializesArrayOfItems;
+use Nuxtifyts\PhpDto\Contexts\PropertyContext;
+use Nuxtifyts\PhpDto\Enums\Property\Type;
+use Nuxtifyts\PhpDto\Exceptions\DeserializeException;
+use Nuxtifyts\PhpDto\Exceptions\SerializeException;
+
+class MixedDataSerializer extends Serializer implements SerializesArrayOfItemsContract
+{
+    use SerializesArrayOfItems;
+
+    /**
+     * @return list<Type>
+     */
+    public static function supportedTypes(): array
+    {
+        return [
+            Type::MIXED,
+        ];
+    }
+
+    /**
+     * @throws SerializeException
+     */
+    protected function serializeItem(mixed $item, PropertyContext $property, object $object): mixed
+    {
+        return match(true) {
+            is_null($item) && $property->isNullable => null,
+
+            default => is_null($item)
+                ? throw new SerializeException('Could not serialize array of BaseDataContract items')
+                : $item,
+        };
+    }
+
+    /**
+     * @throws DeserializeException
+     */
+    protected function deserializeItem(mixed $item, PropertyContext $property): mixed
+    {
+        return match(true) {
+            is_null($item) && $property->isNullable => null,
+
+            default => is_null($item)
+                ? throw new DeserializeException('Could not deserialize array of BaseDataContract items')
+                : $item,
+        };
+    }
+}
diff --git a/src/Support/Traits/HasSerializers.php b/src/Support/Traits/HasSerializers.php
index 0d94c68..89db69e 100644
--- a/src/Support/Traits/HasSerializers.php
+++ b/src/Support/Traits/HasSerializers.php
@@ -12,6 +12,7 @@
 use Nuxtifyts\PhpDto\Serializers\DateTimeSerializer;
 use Nuxtifyts\PhpDto\Serializers\ScalarTypeSerializer;
 use Nuxtifyts\PhpDto\Serializers\Serializer;
+use Nuxtifyts\PhpDto\Serializers\MixedDataSerializer;
 
 trait HasSerializers
 {
@@ -69,6 +70,7 @@ protected static function serializersList(): array
             DateTimeSerializer::class,
             BackedEnumSerializer::class,
             ScalarTypeSerializer::class,
+            MixedDataSerializer::class
         ];
     }
 
diff --git a/tests/Unit/Serializers/MixedDataSerializerTest.php b/tests/Unit/Serializers/MixedDataSerializerTest.php
new file mode 100644
index 0000000..b8ac3f2
--- /dev/null
+++ b/tests/Unit/Serializers/MixedDataSerializerTest.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Nuxtifyts\PhpDto\Tests\Unit\Serializers;
+
+use Nuxtifyts\PhpDto\Contexts\PropertyContext;
+use Nuxtifyts\PhpDto\Contexts\TypeContext;
+use Nuxtifyts\PhpDto\Serializers\MixedDataSerializer;
+use Nuxtifyts\PhpDto\Serializers\Serializer;
+use Nuxtifyts\PhpDto\Tests\Unit\UnitCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+
+#[CoversClass(Serializer::class)]
+#[CoversClass(MixedDataSerializer::class)]
+#[CoversClass(PropertyContext::class)]
+#[CoversClass(TypeContext::class)]
+final class MixedDataSerializerTest extends UnitCase
+{
+
+}