sarutak commented on pull request #28317:
URL: https://github.com/apache/spark/pull/28317#issuecomment-619595475
@dongjoon-hyun I inspected the error message by replacing
`bootstrap.bundle.min.js` with `bootstrap.bundle.js` and insert logging code
before the error message shown like as follows.
```
if (!new RegExp(expectedTypes).test(valueType)) {
console.warn("Property Name: " + property + ", value of the property: " +
config[property] + ", type of the property: " + toType(config[property]));
throw new Error(componentName.toUpperCase() + ": " + ("Option \"" +
property + "\" provided type \"" + valueType + "\" ") + ("but expected type \""
+ expectedTypes + "\"."));
}
```
Then, I found the reason was the type of `null` is regarded as `window` by
HtmlUnit (it's a surprising behavior...).
```
WARN WebConsole: Property Name: sanitizeFn, value of the property: null,
type of the property: window
```
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