JSOM - ListItem from 'GetFileByRelativeUrl' returns System.ArgumentException

I'm trying to retrieve the corresponding ListItem from a page layout in the master page gallery using JSOM. I'm using the same approach that Vadim provides in this question, JSOM - get listitem by file url, as below:

function getAssociatedPageLayoutListItem() {
    var promiseObject = new RSVP.Promise(function (resolve, reject) {

        var pageLayoutListItem = web.getFileByServerRelativeUrl("/_catalogs/masterpage/MyCustomPageLayout.aspx");

        clientContext.load(pageLayoutListItem, 'ListItemAllFields');
        clientContext.executeQueryAsync(
            function () {
                resolve(pageLayoutListItem);
            },
            function (error) {
                reject(error);
            }
        );
    });

    return promiseObject;
}

The problem is that SharePoint returns an ArgumentException with the message Value does not fall within the expected range..

ErrorInfo
ErrorCode=-2147024809
ErrorMessage=Value does not fall within the expected range.
ErrorTypeName=System.ArgumentException
ErrorValue=(null)

I have run into this exception before, and back then it seemed as it had something to do with what fields I requested, but this time I can't seem to fix it. How can I get a clearer picture of what is missing, and how to fix it?

Update Loading only the requested file throws the same error.

clientContext.load(pageLayoutListItem)