TypeError in Archives#show

Showing /apps/digitaltheatrearchive.com/production/releases/20150914175900/app/views/archives/show.html.erb where line #88 raised:

no implicit conversion of nil into String

Extracted source (around line #88):

85:             # Get overall image dimensions
86:             @widest = 0
87:             @images.each do |image|
88:               @overall = FastImage.size Rails.root.to_s + "/public" + image.path
89:               @overall_height_ratio = 574.00 / @overall[1]
90:               @overall_width = @overall_height_ratio * @overall[0]
91:               if @widest < @overall_width

Rails.root: /apps/digitaltheatrearchive.com/production/releases/20150914175900

Application Trace | Framework Trace | Full Trace
app/views/archives/show.html.erb:88:in `+'
app/views/archives/show.html.erb:88:in `block in _app_views_archives_show_html_erb__1842583319821301117_70342804849840'
app/views/archives/show.html.erb:87:in `each'
app/views/archives/show.html.erb:87:in `_app_views_archives_show_html_erb__1842583319821301117_70342804849840'
app/controllers/archives_controller.rb:25:in `show'

Request

Parameters:

{"id"=>"2688"}

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Response

Headers:

None