Throw on invalid data

server/lib/peertube-instance.ts

@@ -41,6 +41,10 @@ async function getVideos (host: string, start: number): Promise<IndexableVideo[]
     json: true
   }, REQUESTS.MAX_RETRIES, REQUESTS.WAIT)
 
+  if (!res.body || !Array.isArray(res.body.data)) {
+    throw new Error('Invalid video data from ' + url)
+  }
+
   return res.body.data.map(v => prepareVideoForDB(v, host))
 }