musistudio/claude-code-router · error

Unsupported PNG format.

Error message

Unsupported PNG format.

What it means

Error "Unsupported PNG format." thrown in musistudio/claude-code-router.

Source

Thrown at packages/electron/src/main/ipc.ts:778

    offset += 4;
    const data = png.subarray(offset, offset + length);
    offset += length + 4;

    if (type === "IHDR") {
      width = data.readUInt32BE(0);
      height = data.readUInt32BE(4);
      bitDepth = data[8];
      colorType = data[9];
      interlaceMethod = data[12];
    } else if (type === "IDAT") {
      idatChunks.push(Buffer.from(data));
    } else if (type === "IEND") {
      break;
    }
  }

  if (width <= 0 || height <= 0 || bitDepth !== 8 || (colorType !== 2 && colorType !== 6) || interlaceMethod !== 0) {
    throw new Error("Unsupported PNG format.");
  }

  const channels = colorType === 6 ? 4 : 3;
  const stride = width * channels;
  const inflated = inflateSync(Buffer.concat(idatChunks));
  const pixels = new Uint8Array(width * height * channels);
  let sourceOffset = 0;
  let previousRow = new Uint8Array(stride);

  for (let y = 0; y < height; y += 1) {
    const filter = inflated[sourceOffset];
    sourceOffset += 1;
    const row = new Uint8Array(stride);
    for (let x = 0; x < stride; x += 1) {
      const raw = inflated[sourceOffset + x];
      const left = x >= channels ? row[x - channels] : 0;
      const up = previousRow[x] ?? 0;
      const upLeft = x >= channels ? previousRow[x - channels] ?? 0 : 0;

View on GitHub (pinned to 99f24806c6)

When it happens

Trigger: Thrown at packages/electron/src/main/ipc.ts:778 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of musistudio/claude-code-router@99f24806c6 (2026-08-27). Data as JSON: /api/errors/c978f75c45dc276c. Report an issue: GitHub.