How can I solve this error?

Code:- 
#convert predictions into text (english)
preds_text = []
for i in preds:
  temp = []
  for j in range(len(i)):
    t=get_word(i[j], eng_tokenizer)
    if j>0:
      if (t == get_word(i[j-1], eng_tokenizer)) or (t== None):
        temp.append('')
      else:
        temp.append(t)
          
    else:
      if(t==None):
        temp.append('')
      else:
        temp.append(t)

        preds_text.append(''.join(temp))
-----------------------------------------------------------------------
Error-

ValueError  Traceback (most recent call last)
<ipython-input-71-9591a77fdabd> in <module>()
      4   temp = []
      5   for j in range(len(i)):
----> 6     t=get_word(i[j], eng_tokenizer)
      7     if j>0:
      8       if (t == get_word(i[j-1], eng_tokenizer)) or (t== None):

<ipython-input-68-55520b29e489> in get_word(n, tokenizer)
      1 def get_word(n, tokenizer):
      2   for word, index in tokenizer.word_index.items():
----> 3     if index == n:
      4       return word
      5       return None

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()