diff --git a/sam3/model/sam3_base_predictor.py b/sam3/model/sam3_base_predictor.py
index 2d699fe19..bed703069 100644
--- a/sam3/model/sam3_base_predictor.py
+++ b/sam3/model/sam3_base_predictor.py
@@ -133,6 +133,14 @@ def start_session(
             init_kwargs["async_loading_frames"] = self.async_loading_frames
         if hasattr(self, "video_loader_type"):
             init_kwargs["video_loader_type"] = self.video_loader_type
+        
+        # Filter init_kwargs to only pass what the model's init_state() accepts
+        import inspect
+
+        sig = inspect.signature(self.model.init_state)
+        valid_params = set(sig.parameters.keys())
+        init_kwargs = {k: v for k, v in init_kwargs.items() if k in valid_params}
+        
         inference_state = self.model.init_state(**init_kwargs)
 
         if not session_id: