Playback crashing with 100% reproduction rate

Plex Players
1

Server Version#: 1.41.8.9834
Player Version#: Web Player 4.147.1

Multiple videos on my server make the web player crash.

This is the error message which appears on the multiple web browsers (Edge/Chrome/Brave/Firefox) on multiple different machines, for multiple users.

This does not happen on android devices, or using the Plex for Windows app.

All of these crashes happen when subtitles are about to be rendered, but the video did contain subtitles before the crash time, which did render correctly.

 {
    "type": "log:message",
    "level": 0,
    "message": "{
  \"type\": \"[object Error]\",
  \"stack\": \"TypeError: Cannot read properties of undefined (reading 'appendItem')\
    at push.79895.e.toSVG (https://app.plex.tv/desktop/js/426-426-d6d3136e34228c87aa3c-plex-4.147.1-4ca0656.js:2:654133)\
    at push.79895.n.preRender (https://app.plex.tv/desktop/js/426-426-d6d3136e34228c87aa3c-plex-4.147.1-4ca0656.js:2:667853)\
    at push.79895.e._onClockTick (https://app.plex.tv/desktop/js/426-426-d6d3136e34228c87aa3c-plex-4.147.1-4ca0656.js:2:650970)\
    at push.79895.n._onClockTick (https://app.plex.tv/desktop/js/426-426-d6d3136e34228c87aa3c-plex-4.147.1-4ca0656.js:2:671272)\
    at push.79895.n.resize (https://app.plex.tv/desktop/js/426-426-d6d3136e34228c87aa3c-plex-4.147.1-4ca0656.js:2:660115)\
    at Bk._rerenderSubtitles (https://app.plex.tv/desktop/js/main-8792-2a3a6cd54db2f198b14c-plex-4.147.1-4ca0656.js:2:1261236)\
    at Bk.componentDidUpdate (https://app.plex.tv/desktop/js/main-8792-2a3a6cd54db2f198b14c-plex-4.147.1-4ca0656.js:2:1258036)\
    at Cl (https://app.plex.tv/desktop/js/426-426...\",
  \"name\": \"TypeError\",
  \"message\": \"Cannot read properties of undefined (reading 'appendItem')\"
}",
    "time": "2025-06-16T15:48:49.711Z"
  },

The only other report I’ve seen of this stems from 2021.

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