diff --git a/lib/excerpt_parser.rb b/lib/excerpt_parser.rb
index 9f11c1f45f8..24fc89792f6 100644
--- a/lib/excerpt_parser.rb
+++ b/lib/excerpt_parser.rb
@@ -101,7 +101,7 @@ class ExcerptParser < Nokogiri::XML::SAX::Document
         @in_quote = true
       end
 
-      if attributes['class'].include?('quote')
+      if attributes['class']&.include?('quote')
         if @keep_quotes || (@keep_onebox_body && attributes['data-topic'].present?)
           @in_quote = false
         end