Build 141 and above.

Java 8
Paper 1.8.8 latest

As far as I can tell, this function isn't present in any version of Spigot.

Steps to recreate:

1. Start profiling with /spark profiler
2. Stop profiling with /spark profiler --stop or /spark sampler --stop

Turns out this is a fairly recent Paper-only method, which I didn't notice in #58 as I was building and testing against Paper 1.15.2.

For now you can use build 140 which doesn't break (this predates the platform data PR being merged).