ruby - Why does the reduce implementation return undefined method + for nil:NilClass once a boolean check returns true -


I need to find the sum of all the digits which are equal to the sum of the factors of their digits. I have an algorithm: 

  def equal_to_sum_of_factorial_digits? (N) n == n.to_s.scan (/ \ d /). Map {| S | s.to_i} .reduce {| ACC, Jay. (J == 0 || J == 1)? 1: ACC + (1.j). Injection (: *)} and start = time Now Answer = (10..145) .readuce {| ACC, Jay. ACC + J. if equals_to_soom_off_factorial_diggs? (J)} says "the answer is # {answer} and it has got # {(time.now-start) * 1000} milliseconds."   
 here  equal_to_sum_of_factorial_digits?  creates a number in separate digits, then adds value to  1  if it is  1  or  0  (1 or 0) The originator of is 1) or if it is  2  above  9 , then its actual value is. The answer then sums up all the values ​​in that property.  
 As long as I do not go beyond 145, the code works (145) The first value is the property, which is its factual number: 145 = 1! + 4! + 5!) This error returns  undefined method for zero '+': NilClass .  
 I do not know why the code after  answer =  is  equal_to_sum_of_factorial_digits?  Returns the method  true  Can someone illuminate me?  
 
 The reason for this is that in the last iteration in  less ,  The reason   was caused by the block being evaluated for  zero  due to zero . Note that the value of  ACC  is the evaluation value of the block for each walk.

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