MOVE-TO expected input to be an agent but got NOBODY instead

What my code does is to set an internal grey patch zone and an external black patch zone, where turtles can multiply (one on each patch). Once a turtle reach the boundary between the gray and the black zones I assigned the variable energy to delay the reproduction of the turtle by certain ticks ( each tick energy grows one unit). When energy reaches certain number I wanted the turtles to hatch new turtles in one of the empty black patches, but after the first generation of new turtles in the black zone i get the runtime error " MOVE-TO expected input to be an agent but got NOBODY instead."

This is my code

breed [greens a-green]
breed [reds a-red]
greens-own[energy]

to setup
  clear-all
  ask patch 0 0 [ ask patches in-radius 15 [set pcolor 3]]
  ask n-of 20 patches with [pcolor = 3][sprout-greens 1 [set color green set energy 0]]
  ask n-of 20 patches with [pcolor = 3][sprout-reds 1 [set color red]]
  reset-ticks
end

to go
  division
  delay-expansion
  expansion
  tick
end

to division
ask greens[
    let empty-space neighbors with [pcolor = 3 and not any? turtles-here] ;crea un set llamado "empty-space" que son los patches negros q rodean a la celula verde y q no estan ocupados
    if any? empty-space [hatch 1 set color green move-to one-of empty-space] ; si existe algun patch negro alrededor, nace una celula verde y se ubica en ese patch
  ]

ask reds[
    let empty-space neighbors with [pcolor = 3 and not any? turtles-here] ;crea un set llamado "empty-space" que son los patches negros q rodean a la celula roja y q no estan ocupados
    if any? empty-space [hatch 1 set color red move-to one-of empty-space] ; si existe algun patch negro alrededor, nace una celula roja y se ubica en ese patch
  ]
end

to delay-expansion
  ask greens[
    let black-space neighbors with [pcolor = black and not any? turtles-here]
    if any? black-space [set energy (energy + 1 )]
  ]
end

to expansion
  ask greens[
    let black-space neighbors with [pcolor = black and not any? turtles-here]
    if energy > 5  [hatch 1 set color blue move-to one-of black-space]
  ]
end