cannot read property of undefined reading sourceAndMap

[young-ren]

Obfuscator version used: 4.0.2
Node version used: 16.13.2
Webpack-obfuscator used: 3.5.1

private extractSourceAndSourceMap(asset: any): { inputSource: string, inputSourceMap: RawSourceMap } {
if (asset.sourceAndMap) { // this place
const { source, map } = asset.sourceAndMap();
return { inputSource: source, inputSourceMap: map };
} else {
return {
inputSource: asset.source(),
inputSourceMap: asset.map()
}
}
}