`LTXV In Context Sampler` `optional_cond_image` replaced with `optional_cond_images` and erros with `'NoneType' object is not iterable`

[Sean-Bradley]

In the 2025 version, the LTXV In Context Sampler had an optional_cond_image, you could provide it an image and it would work as the first frame.

ComfyUI-LTXVideo/easy_samplers.py

Lines 487 to 492 in ee11be3

	"optional_cond_image": (
	"IMAGE",
	{
	"tooltip": "The image to use for conditioning the sampling, if not provided, the sampling will be unconditioned (t2v setup). The image will be resized to the size of the first frame."
	},
	),

But in the latest version 2026, it has been replaced with optional_cond_images

ComfyUI-LTXVideo/easy_samplers.py

Lines 649 to 654 in e1d2cff

	"optional_cond_images": (
	"IMAGE",
	{
	"tooltip": "The image to use for conditioning the sampling, if not provided, the sampling will be unconditioned (t2v setup). The image will be resized to the size of the first frame."
	},
	),

And now it no longer works.

If I provide it a single image, I now get error 'NoneType' object is not iterable

If I provide it video images, I also get the error 'NoneType' object is not iterable

Normally you would give it an image, but since it was renamed to images, then maybe it now wants images. But I don't think so. I think it wants an image, despite the renaming of it. But it no longer accepts an image.

[Sean-Bradley]

still broken in ComfyUI relese 0.8.0.
optional_cond_image was changed to optional_cond_images and now it doesn't work.

  File "H:\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-LTXVideo\easy_samplers.py", line 767, in sample
    for cond_image, cond_idx in zip(
                                ~~~^
        optional_cond_images, optional_cond_indices
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ):
    ^
TypeError: 'NoneType' object is not iterable