Here's a snippet of the log from heroku.
�[1m�[35m (0.9ms)�[0m �[1m�[34mSELECT SUM("carts"."qty") FROM "carts" WHERE
"carts"."product_id" = 1641�[0m
2018-10-13T01:57:05.838933+00:00 app[web.1]: �[1m�[35m (0.8ms)�[0m
�[1m�[35mBEGIN�[0m
2018-10-13T01:57:05.841836+00:00 app[web.1]: �[1m�[35m (0.8ms)�[0m
�[1m�[31mROLLBACK�[0m
2018-10-13T01:57:05.844891+00:00 app[web.1]: Completed 500 Internal Server
Error in 49ms (ActiveRecord: 17.5ms)
2018-10-13T01:57:05.845990+00:00 app[web.1]:
2018-10-13T01:57:05.846119+00:00 app[web.1]: NoMethodError (undefined
method empty?' for nil:NilClass): 2018-10-13T01:57:05.846157+00:00
app[web.1]: 2018-10-13T01:57:05.846206+00:00 app[web.1]:
app/controllers/products_controller.rb:85:in block (2 levels) in show'
2018-10-13T01:57:05.846208+00:00 app[web.1]:
app/controllers/products_controller.rb:77:in `show'
2018-10-13T01:57:05.847916+00:00 heroku[router]: at=info method=GET
path="/products/1641" host=cryptic-inlet-13518.herokuapp.com
request_id=035eb706-bb86-4dbd-86c7-a183b3a493e7 fwd="99.248.30.134"
dyno=web.1 connect=1ms service=59ms status=500 bytes=1754 protocol=https
This error in production occurs when the last item is put into a cart (and
the campaign is funded). But it works fine in development.
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