ValueError: Unsupported ONNX attribute: name: "then_branch"

Does this error mean that if?

`ValueError: Unsupported ONNX attribute: name: "then_branch"
g {
  node {
    input: "1910"
    output: "1917"
    name: "Squeeze_1533"
    op_type: "Squeeze"
    attribute {
      name: "axes"
      ints: -1
      type: INTS
    }
  }
  name: "torch-jit-export1"
  output {
    name: "1917"
  }
}
type: GRAPH`