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Level Sequence: Game crashes when "SetPlaybackPosition" is called by Sequencer

We've encountered a bug that leads to a complete crash of your application (editor + build) and here's how to reproduce it:

  1. Create a new level and save it

  2. Add a new level sequence to your level

  3. Add a new event track to your level sequence and add an event at a desired frame (for example: 50)

  4. Name the added event (for example: "SequencerEvent")

  5. Save your level sequence and open your level blueprint

  6. Get a reference to your level sequence and play it on "BeginPlay"

  7. Add a new custom event which is named after the sequencer event (in this case: "SequencerEvent")

  8. Put the execution pin of your custom event into a "SetPlaybackPosition" node and enter a valid time (for example: "0.1")

  9. Save all

  10. Playtest

  11. Unreal will crash

  12. Add a "Delay" node with duration value "0" right after your custom event before you call "SetPlaybackPosition". Unreal won't crash in this case

I've attached some screenshots that show the different repro steps: alt text alt text alt text

Product Version: UE 4.18
02-levelbp.png (175.0 kB)
03-crash.png (252.2 kB)
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asked Nov 30 '17 at 11:41 AM in Bug Reports

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Hi there, thanks for the report. This was recently fixed and will be available in 4.19.

Here's the report: https://issues.unrealengine.com/issue/UE-52270

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answered Nov 30 '17 at 02:04 PM

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Max.Chen STAFF
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