本番環境で非言語処理がエラーになる

前提・実現したいこと

Railsで非言語処理の設定をしたいです。
仮想環境では問題なく動いておりますが、本番環境ではエラーになってしまい原因がわかりませんでした。
ご教授いただけますと幸いです。

発生している問題・エラーメッセージ

Completed 500 Internal Server Error in 281ms (ActiveRecord: 1.2ms
NoMethodError (undefined method `[]' for nil:NilClass):
lib/language.rb:27:in `get_data'

該当のソースコード

controller
1class CommentsController < ApplicationController
2	def create
3		@problem = Problem.find(params[:comment][:problem_id])
4		@comment = @problem.comments.new(comment_params)
5		@comment.customer_id = current_customer.id
6		@comment.score = Language.get_data(params[:comment][:body] )
7		if@comment.save
8		  redirect_to problem_path(@problem)
9		else
10		@comments = Comment.where(problem_id: @problem.id)
11		render template: "problems/show"
12		end
13	end

lib/language.rb

lib
1require 'base64'
2require 'json'
3require 'net/https'
4module Language
5  class << self
6    def get_data(text)
7      api_url = [ここにAPIkey書いてます]
8      # APIリクエスト用のJSONパラメータ
9      params = {
10        document: {
11          type: 'PLAIN_TEXT',
12          content: text
13        }
14      }.to_json
15      # Google Cloud Natural Language APIにリクエスト
16      uri = URI.parse(api_url)
17      https = Net::HTTP.new(uri.host, uri.port)
18      https.use_ssl = true
19      request = Net::HTTP::Post.new(uri.request_uri)
20      request['Content-Type'] = 'application/json'
21      response = https.request(request, params)
22      # APIレスポンス出力
23      pp request
24      pp params
25      pp response
26      pp response.body
27      JSON.parse(response.body)['documentSentiment']['score']
28    end
29  end
30end
31

show
1	<h3>コメント</h3>
2	  <% @comments.each do |comment| %>
3		<div class="comment-content">
4			<span><%= attachment_image_tag comment.customer,:image, :fill,60,60 ,format: 'jpeg',fallback: "no_image.jpg" ,class: "customer-image" %></span>
5			<span><%= comment.created_at.strftime('%Y/%m/%d') %></span><br>
6			<span class="comment-body"><%= comment.body %></span>
7			<span id="likes_buttons_<%= comment.id %>">
8			<%= render partial: 'likes/like', locals: { comment: comment} , class: 'like' %>
9					</span>
10			<% if comment.customer_id == current_customer.id %>
11				<span><%= link_to comment_path(comment), method: :delete do %></span>
12				<i class="far fa-trash-alt"></i>
13			    <% end %>
14			<% end %>
15			<% if comment&.score.to_i >= 1.5  %>
16				<i class="fas fa-praying-hands"></i>
17				<td class="score_comment1">VeryGood</td>
18				<% elsif comment&.score.to_i <= 1.4 && comment&.score.to_i >= 0.7 %>
19				<td><i class="far fa-thumbs-up"></i></td>
20				<td class="score_comment2">good</td>
21				<% else  %>
22				<td><i class="far fa-thumbs-down"></i></td>
23				<td class="score_comment3">Bad</td>
24			<% end %>
25		</div>
26	<% end %>

shema
1 create_table "comments", force: :cascade do |t|
2    t.integer "customer_id"
3    t.integer "problem_id"
4    t.text "body"
5    t.decimal "score", precision: 5, scale: 3
6    t.datetime "created_at", null: false
7    t.datetime "updated_at", null: false
8  end