if end_latent is not None and is_end_of_video:

app.py

@@ -1053,7 +1053,7 @@ def worker_video(input_video, end_frame, end_stillness, prompts, n_prompt, seed,
                 return
 
         def compute_latent(history_latents, latent_window_size, latent_padding_size, num_clean_frames, start_latent, end_latent, end_stillness, is_end_of_video):
-            if is_end_of_video:
+            if end_latent is not None and is_end_of_video:
                 local_end_stillness = end_stillness
                 local_end_latent = end_latent.expand(-1, -1, 1 + local_end_stillness, -1, -1)
             else: