discourse/discourse · error

File with a 0 byte size detected, cancelling upload.

Error message

File with a 0 byte size detected, cancelling upload.

What it means

Error "File with a 0 byte size detected, cancelling upload." thrown in discourse/discourse.

Source

Thrown at frontend/discourse/app/lib/uploads.js:135

        })
      );
      return false;
    }
  }

  if (!opts.bypassNewUserRestriction) {
    // ensures that new users can upload a file
    if (user && !user.isAllowedToUploadAFile(opts.type)) {
      dialog.alert(
        i18n(`post.errors.${opts.type}_upload_not_allowed_for_new_user`)
      );
      return false;
    }
  }

  if (file.size === 0) {
    /* eslint-disable no-console */
    console.warn("File with a 0 byte size detected, cancelling upload.", file);
    dialog.alert(i18n("post.errors.file_size_zero"));
    return false;
  }

  // everything went fine
  return true;
}

function extensionsToArray(exts) {
  return exts
    .toLowerCase()
    .replace(/[\s\.]+/g, "")
    .split("|")
    .filter((ext) => !ext.includes("*"));
}

function extensions(siteSettings) {
  return extensionsToArray(siteSettings.authorized_extensions);

View on GitHub (pinned to 1b2d7253e8)

When it happens

Trigger: Thrown at frontend/discourse/app/lib/uploads.js:135 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of discourse/discourse@1b2d7253e8 (2026-08-26). Data as JSON: /api/errors/318b3eeaea8fc5b1. Report an issue: GitHub.