[Home](./index.md) > [bitburner](./bitburner.md) > [RunOptions](./bitburner.runoptions.md) > [preventDuplicates](./bitburner.runoptions.preventduplicates.md) ## RunOptions.preventDuplicates property Should we fail to run if another instance is running with the exact same arguments? This used to be the default behavior, now defaults to false. **Signature:** ```typescript preventDuplicates?: boolean; ```