Crawl: Error when url contains query parameter

[jahredhope]

I get the following error when using crawl to automatically find paths.
Error: EISDIR: illegal operation on a directory, open '{dir}'
This error appears half-way through creating files, the file that it got up to will be empty and no further files will be rendered.

I believe this is due to StaticSiteGeneratorPlugin attempting to generate file twice when it picks up two paths that differ only by query parameters.

When adding console.log just after the call to pathToAssetName I recieve an output of

assetName foo/bar/index.html
assetName foo/bar?id=123&m=val/index.html