LykosAI/StabilityMatrix · error · ValidationException

CurrentBitmapSize is null

Error message

CurrentBitmapSize is null

What it means

Thrown in SelectImageCardViewModel.ApplyStep when the loaded image's bitmap size is empty (width and height 0), which means no valid bitmap dimensions are available for the mask workflow. The mask setup needs the canvas size to scale the mask render to the image, so an empty size is rejected.

Solutions

1. Wait for the image to fully load/decode before clicking Generate (check that a preview thumbnail is visible)
2. Re-select the image so CurrentBitmapSize is recomputed from the decoded bitmap
3. Verify the image file is a valid, non-zero-dimension image

Example fix

// before: CurrentBitmapSize.IsEmpty -> throws
// after: guard before applying
if (vm.CurrentBitmapSize.IsEmpty) { throw new InvalidOperationException("Image not fully loaded"); }
await vm.ApplyStep(args);

if (vm.ImageSource is not null && vm.CurrentBitmapSize.IsEmpty)
    throw new ValidationException("Image is still loading; wait for the preview before generating");

bool hasValidBitmapSize = !vm.CurrentBitmapSize.IsEmpty;

try { vm.ApplyStep(args); }
catch (ValidationException ex) when (ex.Message == "CurrentBitmapSize is null") { /* await image load completion */ }

When it happens

Trigger: ApplyStep in the mask branch where CurrentBitmapSize.IsEmpty is true — i.e. ImageSource may be set but the bitmap size was never computed or the image failed to decode.

Common situations: Image load was asynchronous and the size property was read before decoding finished; corrupted or zero-dimension image file selected; bitmap disposed or reset by view state changes before generation starts.

Understand the failure class

Background: "missing required argument" and "the following required arguments were not provided": what required-argument errors mean and how to fix them — this error's family across 20 libraries.

Related errors

• Input Image is required
• API key is required
• Archive must be a zipped tar.
• Definition: ' ' has options, it must have exactly 1 option…
• Definition ' ' has InitialValue of ' ', but it was not…

AI-assisted analysis of LykosAI/StabilityMatrix@af93d6ef57 (2026-09-12). Data as JSON: /api/errors/6dd88814ef66f081. Report an issue: GitHub.

Appendix: source

Thrown at StabilityMatrix.Avalonia/ViewModels/Inference/SelectImageCardViewModel.cs:164

        }

        tabContext.SourceImageWidth = CurrentBitmapSize.Width > 0 ? CurrentBitmapSize.Width : 0;
        tabContext.SourceImageHeight = CurrentBitmapSize.Height > 0 ? CurrentBitmapSize.Height : 0;
    }

    /// <inheritdoc />
    public void ApplyStep(ModuleApplyStepEventArgs e)
    {
        // With Mask image
        if (IsMaskEditorEnabled && MaskEditorViewModel.IsMaskEnabled)
        {
            MaskEditorViewModel.PaintCanvasViewModel.CanvasSize = CurrentBitmapSize;

            e.Builder.SetupImagePrimarySourceWithMask(
                ImageSource ?? throw new ValidationException("Input Image is required"),
                !CurrentBitmapSize.IsEmpty
                    ? CurrentBitmapSize
                    : throw new ValidationException("CurrentBitmapSize is null"),
                MaskEditorViewModel.GetCachedOrNewMaskRenderInverseAlphaImage(),
                MaskEditorViewModel.PaintCanvasViewModel.CanvasSize,
                e.Builder.Connections.BatchIndex
            );
        }
        // Normal image only
        else
        {
            e.Builder.SetupImagePrimarySource(
                ImageSource ?? throw new ValidationException("Input Image is required"),
                !CurrentBitmapSize.IsEmpty
                    ? CurrentBitmapSize
                    : throw new ValidationException("CurrentBitmapSize is null"),
                e.Builder.Connections.BatchIndex
            );
        }
    }

View on GitHub (pinned to af93d6ef57)