When we server travel with seamless travel enabled, and a legacy camera shake with an anim sequence set is currently ongoing, we will get a crash due to the UMovieSceneEntitySystemLinker failing a check. This only occurs when seamless traveling and only with legacy camera shakes that have an anim sequence set. This occurs both in PIE and packaged builds.


Steps to Reproduce
  • Create two new levels, a start level and a destination level
  • Create a new game mode with Use Seamless Travel set to true
  • Use this game mode in the two new levels
  • Create a new camera animation sequence
  • Create a new blueprint class derived from LegacyCameraShake
  • Set the Anim Sequence in the new legacy camera shake class to the new camera animation sequence
  • Optionally set some oscillation values to make it easier to debug that the camera shake is playing
  • On the begin play of the start level include the following:
  • Execute the console command: net.AllowPIESeamlessTravel true
  • Start the camera shake of the new legacy camera shake class
  • Delay for some amount of time less than the duration of the camera shake
  • Start Server Travel to the destination level
  • Observe a crash upon commencing server travel

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ComponentUE - Anim - Sequencer
Affects Versions5.
Target Fix5.5
Fix Commit33290821
CreatedMar 14, 2024
ResolvedApr 28, 2024
UpdatedApr 30, 2024