It looks like the fire has gone out. Call Prometheus!
Babylon.js Playground
Uncaught (in promise) An error occurred with the creation of your particle system.
Check if your type ‘fire’ exists.
Ouch!
Let me fix that 
Oupsie:
Fix call order by deltakosh · Pull Request #16548 · BabylonJS/Babylon.js
Will be live tomorrow 