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Computer Science Algorithms: Sorting and Searching Sorting Algorithms Bogosort

Help fixing Ruby "is sorted" function please

def is_sorted(list)
  list.each_with_index do |item, idx|
    if item > list[idx + 1]
      return false
  return true

File.open('input.txt') do |file|
  numbers = file.readlines.map { |line| line.to_i }
  puts(is_sorted numbers)

I'm getting an error trying to compare a nil value with an integer.