invoke-ai/InvokeAI · error · ValueError

Unsupported IP-Adapter image type: {type(ip_adapter_field.im

Error message

Unsupported IP-Adapter image type: {type(ip_adapter_field.image)}

What it means

After normalizing, each IPAdapterField.image must be an ImageField or a list of ImageFields. FLUX IP-Adapter (XLabs) requires exactly one CLIP image prompt, so any other type (None, string, PIL image, etc.) raises this ValueError instead of failing later inside the model.

Source

Thrown at invokeai/app/invocations/flux_denoise.py:924

        self,
        ip_adapter_fields: list[IPAdapterField],
        context: InvocationContext,
        device: torch.device,
    ) -> tuple[list[torch.Tensor], list[torch.Tensor]]:
        """Run the IPAdapter CLIPVisionModel, returning image prompt embeddings."""
        clip_image_processor = CLIPImageProcessor()

        pos_image_prompt_clip_embeds: list[torch.Tensor] = []
        neg_image_prompt_clip_embeds: list[torch.Tensor] = []
        for ip_adapter_field in ip_adapter_fields:
            # `ip_adapter_field.image` could be a list or a single ImageField. Normalize to a list here.
            ipa_image_fields: list[ImageField]
            if isinstance(ip_adapter_field.image, ImageField):
                ipa_image_fields = [ip_adapter_field.image]
            elif isinstance(ip_adapter_field.image, list):
                ipa_image_fields = ip_adapter_field.image
            else:
                raise ValueError(f"Unsupported IP-Adapter image type: {type(ip_adapter_field.image)}")

            if len(ipa_image_fields) != 1:
                raise ValueError(
                    f"FLUX IP-Adapter only supports a single image prompt (received {len(ipa_image_fields)})."
                )

            ipa_images = [context.images.get_pil(image.image_name, mode="RGB") for image in ipa_image_fields]

            pos_images: list[npt.NDArray[np.uint8]] = []
            neg_images: list[npt.NDArray[np.uint8]] = []
            for ipa_image in ipa_images:
                assert ipa_image.mode == "RGB"
                pos_image = np.array(ipa_image)
                # We use a black image as the negative image prompt for parity with
                # https://github.com/XLabs-AI/x-flux-comfyui/blob/45c834727dd2141aebc505ae4b01f193a8414e38/nodes.py#L592-L593
                # An alternative scheme would be to apply zeros_like() after calling the clip_image_processor.
                neg_image = np.zeros_like(pos_image)
                pos_images.append(pos_image)

View on GitHub (pinned to 0b6a024f2f)

Solutions

Ensure the IP-Adapter invocation's image input is connected to a Load Image invocation so image is a proper ImageField.
If constructing IPAdapterField in code, pass ImageField(image_name=..., image_type=...), not a string or PIL object.
Re-export/re-save the workflow with the current InvokeAI schema to migrate stale field values.

Example fix

// before
field = IPAdapterField(ip_adapter_model=..., image="my-image.png", weight=1.0)
// after
from invokeai.app.invocations.primitives import ImageField
field = IPAdapterField(ip_adapter_model=..., image=ImageField(image_name="my-image.png", image_type="results"), weight=1.0)

Defensive patterns

Strategy: validation

Validate before calling

img = ip_adapter_field.image
assert isinstance(img, ImageField) or (isinstance(img, list) and all(isinstance(i, ImageField) for i in img)), "image must be ImageField or list[ImageField]"

Type guard

def is_valid_ipa_image(image) -> bool:
    if isinstance(image, ImageField):
        return True
    return isinstance(image, list) and all(isinstance(i, ImageField) for i in image)

Try / catch

try:
    result = flux_denoise.invoke(context)
except ValueError as e:
    if "Unsupported IP-Adapter image type" in str(e):
        log.error("IPAdapterField.image must be an ImageField, not %s", type(ip_adapter_field.image))
    else:
        raise

Prevention

Always connect a Load Image node to the IP-Adapter image input.
Never pass raw image-name strings when constructing IPAdapterField in scripts.
Re-save old workflows under the current schema before reuse.

When it happens

Trigger: An IPAdapterField whose image attribute holds something other than ImageField/list[ImageField] — typically a hand-constructed field, a migrated graph with a missing image connection, or a custom node populating image with a string image name.

Common situations: Custom scripts building IPAdapterField programmatically and passing the image name string instead of an ImageField; workflows imported from older schema versions where the image reference was not upgraded.

Related errors

AI-assisted analysis of invoke-ai/InvokeAI@0b6a024f2f (2026-08-29). Data as JSON: /api/errors/d695d7fb8391b662. Report an issue: GitHub.