diff --git a/vr180_streaming/sam2_streaming_simple.py b/vr180_streaming/sam2_streaming_simple.py
index 5c8fdb4..dd90454 100644
--- a/vr180_streaming/sam2_streaming_simple.py
+++ b/vr180_streaming/sam2_streaming_simple.py
@@ -227,6 +227,11 @@ class SAM2StreamingProcessor:
             frame_shape = self.frame_buffer[-1]['frame'].shape
             return np.zeros((frame_shape[0], frame_shape[1]), dtype=np.uint8)
             
+        except Exception as e:
+            print(f"   Warning: Mask propagation failed: {e}")
+            frame_shape = self.frame_buffer[-1]['frame'].shape
+            return np.zeros((frame_shape[0], frame_shape[1]), dtype=np.uint8)
+    
     def _propagate_existing_objects(self) -> np.ndarray:
         """Propagate existing objects without adding new detections"""
         if not self.object_ids or not self.frame_buffer: