diff --git a/agent_scheduler/task_helpers.py b/agent_scheduler/task_helpers.py
index a991fe1..9737997 100644
--- a/agent_scheduler/task_helpers.py
+++ b/agent_scheduler/task_helpers.py
@@ -162,28 +162,38 @@ def serialize_controlnet_args(cnet_unit):
     args: dict = cnet_unit.__dict__
     args["is_cnet"] = True
     for k, v in args.items():
-        if k == "image" and v is not None:
+        if k == "image" and hasattr(v, "image") and v.image is not None:
+            print("serialize image for controlnet")
             args[k] = {
                 "image": serialize_image(v["image"]),
                 "mask": serialize_image(v["mask"])
                 if v.get("mask", None) is not None
                 else None,
             }
-        if isinstance(v, Enum):
-            args[k] = v.value
+        elif k == 'image' and isinstance(v, (np.ndarray, torch.Tensor, Image.Image)):
+            args[k] = serialize_image(v)
+        elif isinstance(v, Enum):
+            args[k] = serialize_image(v.value)
+        else:
+            args[k] = serialize_image(v)
 
     return args
 
 
 def deserialize_controlnet_args(args: dict):
     for k, v in args.items():
-        if k == "image" and v is not None:
+        if k == "image" and hasattr(v, "image") and v.image is not None:
+            print("deserialize image for controlnet")
             args[k] = {
                 "image": deserialize_image(v["image"]),
                 "mask": deserialize_image(v["mask"])
                 if v.get("mask", None) is not None
                 else None,
             }
+        elif isinstance(v, dict) and v.get("cls", None) in ["Image", "ndarray", "Tensor"]:
+            args[k] = deserialize_image(v)
+        else:
+            args[k] = v
 
     return args
 
diff --git a/agent_scheduler/task_runner.py b/agent_scheduler/task_runner.py
index 82c7bd8..2a89879 100644
--- a/agent_scheduler/task_runner.py
+++ b/agent_scheduler/task_runner.py
@@ -65,7 +65,6 @@ class ParsedTaskArgs(BaseModel):
     script_args: list[Any]
     checkpoint: Optional[str] = None
 
-
 class TaskRunner:
     instance = None
 
@@ -105,6 +104,52 @@ class TaskRunner:
     @property
     def paused(self) -> bool:
         return getattr(shared.opts, "queue_paused", False)
+    
+    def recursively_serialize(self, obj):
+        """
+        Recursively serialize an object to JSON
+        """
+        # dict
+        if isinstance(obj, dict):
+            new_obj = {}
+            for k, v in obj.items():
+                assert k not in new_obj, "Cannot serialize recursive dict"
+                new_obj[k] = self.recursively_serialize(v)
+            return new_obj
+        elif isinstance(obj, list):
+            new_obj = []
+            for v in obj:
+                assert v is not obj, "Cannot serialize recursive list"
+                new_obj.append(self.recursively_serialize(v))
+            return new_obj
+        # image or tensor or ndarray
+        elif isinstance(obj, (Image.Image, Tensor, ndarray)):
+            return serialize_image(obj)
+        # controlnet
+        elif self.UiControlNetUnit and isinstance(obj, self.UiControlNetUnit):
+            return serialize_controlnet_args(obj)
+        else:
+            # check json.dumps
+            return obj
+        
+    def recursively_deserialize(self, obj):
+        """
+        Recursively deserialize an object from JSON
+        """
+        if isinstance(obj, dict):
+            new_obj = {}
+            for k, v in obj.items():
+                new_obj[k] = self.recursively_deserialize(v)
+            return new_obj
+        elif isinstance(obj, list):
+            new_obj = []
+            for v in obj:
+                new_obj.append(self.recursively_deserialize(v))
+            return new_obj
+        elif isinstance(obj, dict) and obj.get("is_cnet", False):
+            return deserialize_controlnet_args(obj)
+        else:
+            return deserialize_image(obj)
 
     def __serialize_ui_task_args(self, is_img2img: bool, *args, checkpoint: str = None):
         named_args, script_args = map_ui_task_args_list_to_named_args(
@@ -116,16 +161,27 @@ class TaskRunner:
             serialize_img2img_image_args(named_args)
 
         # loop through script_args and serialize images
+        serialized_args:list = [None] * len(script_args)
         for i, a in enumerate(script_args):
             if isinstance(a, (Image.Image, ndarray, Tensor)):
-                script_args[i] = serialize_image(a)
+                serialized_args[i] = serialize_image(a)
             elif self.UiControlNetUnit and isinstance(a, self.UiControlNetUnit):
-                script_args[i] = serialize_controlnet_args(a)
-
+                serialized_args[i] = serialize_controlnet_args(a)
+            else:
+                serialized_args[i] = self.recursively_serialize(a)
+        # assert each arguments is serializable
+        check_args = [named_args, serialized_args, checkpoint]
+        args_name = ["named_args", "script_args", "checkpoint"]
+        for args, name in zip(check_args, args_name):
+            try:
+                json.dumps(args)
+            except Exception as e:
+                print(f"Cannot serialize args: {args} with name: {name}")
+                raise e
         return json.dumps(
             {
                 "args": named_args,
-                "script_args": script_args,
+                "script_args": serialized_args,
                 "checkpoint": checkpoint,
                 "is_ui": True,
                 "is_img2img": is_img2img,
@@ -159,16 +215,26 @@ class TaskRunner:
     def __deserialize_ui_task_args(
         self, is_img2img: bool, named_args: dict, script_args: list
     ):
+        """
+        Deserialize UI task arguments
+        In-place update named_args and script_args
+        """
         # loop through image_args and deserialize images
         if is_img2img:
             deserialize_img2img_image_args(named_args)
-
+        
+        deserialized_args:list = [None] * len(script_args)
         # loop through script_args and deserialize images
         for i, arg in enumerate(script_args):
             if isinstance(arg, dict) and arg.get("is_cnet", False):
-                script_args[i] = deserialize_controlnet_args(arg)
+                deserialized_args[i] = deserialize_controlnet_args(arg)
             elif isinstance(arg, dict) and arg.get("cls", "") in {"Image", "ndarray", "Tensor"}:
-                script_args[i] = deserialize_image(arg)
+                deserialized_args[i] = deserialize_image(arg)
+            else:
+                deserialized_args[i] = self.recursively_deserialize(arg)
+        for i, arg in enumerate(deserialized_args):
+            script_args[i] = arg
+        
 
     def __deserialize_api_task_args(self, is_img2img: bool, named_args: dict):
         # load images from disk