Crash: java.lang.NullPointerException: Cannot invoke "dpo.n()" because "$$2" is null

In a void world:

Summon 30~ frogs and another 30 small magmacubes inside a tube, like that one in the next picture:

Then, before frogs eats all magmacubes, execute that command:

/tp @e[type=!minecraft:player] @s 

 

Now your game should freeze like in that piceture and suddenly crash.

 

For convenience, here it's a command to give yourself a magamablock spawnegg

/give @s minecraft:magma_cube_spawn_egg{EntityTag:{Health:1.0f,Size:0}} 1