Fix issue TypeError: Cannot read properties of undefined (reading 'runs') at Module.get_playlist

src/mixins/playlist.ts

@@ -179,7 +179,7 @@ export async function get_playlist(
     thumbnails: j(header, THUMBNAILS),
     description: jo(header, "description", DESCRIPTION_SHELF, DESCRIPTION),
     type: run_count > 0 ? j(header, SUBTITLE) : null,
-    authors: parse_song_artists_runs(header.straplineTextOne.runs),
+    authors: parse_song_artists_runs(header.straplineTextOne?.runs),
     year: j(header, "subtitle.runs", (run_count - 1).toString(), "text"),
     trackCount: secondRuns ? secondRuns[0].text : null,
     duration: secondRuns && secondRuns.length > 2 ? secondRuns[2].text : null,

src/parsers/songs.ts

@@ -116,26 +116,22 @@ export interface ArtistRun {
 }
 
 export function parse_song_artists_runs(runs: any) {
+  if (!runs || !Array.isArray(runs)) {
+    return [];
+  }
   const artists: ArtistRun[] = [];
-  const result = Array(Math.floor(runs.length / 2) + 1).fill(undefined).map((
-    _,
-    index,
-  ) => index);
-
-  for (const i of result) {
-    const run = runs[i * 2];
-
-    if (run == null) continue;
-
+  // Iterate through every other element in 'runs' because each artist entry is located at even indices.
+  for (let i = 0; i < runs.length; i += 2) {
+    const run = runs[i];
+    if (run === null || run === undefined)
+      continue;
     const page_type = jo(run, NAVIGATION_PAGE_TYPE);
-
     artists.push({
       name: run.text,
       id: jo(run, NAVIGATION_BROWSE_ID),
       type: page_type === "MUSIC_PAGE_TYPE_ARTIST" ? "artist" : "channel",
     });
   }
-
   return artists;
 }