From f9755820dedae6f9c6aec2547dabdcb511c632d9 Mon Sep 17 00:00:00 2001
From: kijai <40791699+kijai@users.noreply.github.com>
Date: Mon, 1 Sep 2025 14:19:51 +0300
Subject: [PATCH] handle negative latent indices with extra latents

---
 nodes.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nodes.py b/nodes.py
index d2bf2fd..aaa3758 100644
--- a/nodes.py
+++ b/nodes.py
@@ -2314,6 +2314,10 @@ class WanVideoSampler:
             for entry in extra_latents:
                 add_index = entry["index"]
                 num_extra_frames = entry["samples"].shape[2]
+                # Handle negative indices
+                if add_index < 0:
+                    add_index = noise.shape[1] + add_index
+                add_index = max(0, min(add_index, noise.shape[1] - num_extra_frames))
                 if start_step == 0:
                     noise[:, add_index:add_index+num_extra_frames] = entry["samples"].to(noise)
                     log.info(f"Adding extra samples to latent indices {add_index} to {add_index+num_extra_frames-1}")