message: Avoid console error caused by `forked-to`
diff: @@ -55,12 +55,15 @@ async function updateForks(forks: string[]): Promise<void> {
  }
  }
  -async function init(): Promise<void> {
  - select('details-dialog[src*="/fork"] include-fragment')!
  - .addEventListener('load', saveAllForks);
  +async function init(): Promise<void | false> {
  + const fragment = select('details-dialog[src*="/fork"] include-fragment');
  + if (!fragment) {
  + return false;
  + }
  - const forks = await cache.get<string[]>(getCacheKey());
  + fragment.addEventListener('load', saveAllForks);
  + const forks = await cache.get<string[]>(getCacheKey());
  if (!forks) {
  return;
  }
  