diff --git a/vr180_matting/sam2_wrapper.py b/vr180_matting/sam2_wrapper.py
index ac8774b..abc5253 100644
--- a/vr180_matting/sam2_wrapper.py
+++ b/vr180_matting/sam2_wrapper.py
@@ -7,6 +7,7 @@ import warnings
 import os
 import tempfile
 import shutil
+import gc
 
 try:
     from sam2.build_sam import build_sam2_video_predictor
@@ -257,11 +258,11 @@ class SAM2VideoMatting:
         if self.inference_state is not None:
             try:
                 # Reset SAM2 state first (critical for memory cleanup)
-                if hasattr(self.predictor, 'reset_state'):
+                if self.predictor is not None and hasattr(self.predictor, 'reset_state'):
                     self.predictor.reset_state(self.inference_state)
                 
                 # Fallback to cleanup_state if available
-                elif hasattr(self.predictor, 'cleanup_state'):
+                elif self.predictor is not None and hasattr(self.predictor, 'cleanup_state'):
                     self.predictor.cleanup_state(self.inference_state)
                 
                 # Explicitly delete inference state and video segments
@@ -275,15 +276,6 @@ class SAM2VideoMatting:
             finally:
                 self.inference_state = None
         
-        # Explicitly delete predictor
-        if self.predictor is not None:
-            try:
-                del self.predictor
-            except Exception as e:
-                warnings.warn(f"Failed to delete predictor: {e}")
-            finally:
-                self.predictor = None
-        
         # Clean up temporary video file
         if self.temp_video_path is not None:
             try:
@@ -299,9 +291,15 @@ class SAM2VideoMatting:
             torch.cuda.empty_cache()
         
         # Force garbage collection (critical for memory leak prevention)
-        import gc
         gc.collect()
+        
+        # Clear predictor reference (but don't delete the object itself)
+        self.predictor = None
     
     def __del__(self):
         """Destructor to ensure cleanup"""
-        self.cleanup()
\ No newline at end of file
+        try:
+            self.cleanup()
+        except Exception:
+            # Ignore errors during Python shutdown
+            pass
\ No newline at end of file