TypeError in Home#index

Showing /apps/digitaltheatrearchive.com/production/releases/20150914175900/app/views/home/index.html.erb where line #19 raised:

no implicit conversion of nil into String

Extracted source (around line #19):

16:                             <%= 
17:                                 @image = Image.find(:first, :conditions => {:identifier => slide.identifier})
18:                                 if @image
19:                                     raw(image_resize(@image.path, "360X574", ""))
20:                                 else
21:                                     raw('<img src="/assets/home-highlights/1.jpg" />')
22:                                 end

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

Application Trace | Framework Trace | Full Trace
app/helpers/application_helper.rb:27:in `+'
app/helpers/application_helper.rb:27:in `image_resize'
app/views/home/index.html.erb:19:in `block in _app_views_home_index_html_erb___4160289823711820030_70342795815900'
app/views/home/index.html.erb:13:in `each'
app/views/home/index.html.erb:13:in `_app_views_home_index_html_erb___4160289823711820030_70342795815900'

Request

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Response

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