Deno bundle duplicating variables

Using Deno 1.26.2

I am trying to bundle https://github.com/Savory/Danet-Starter using deno bundle run.ts standalone-starter.jsdeno bundle run.ts standalone-starter.js

However, the generated standalone-starter.jsstandalone-starter.js contains duplicated variable declaration, resulting in error: Uncaught SyntaxError: Identifier 'mod' has already been declarederror: Uncaught SyntaxError: Identifier 'mod' has already been declared while trying to use deno run standalone-starter.jsdeno run standalone-starter.js.

Did I do something wrong or is it a bug ?