Prevent exceptions with invalid URIs

app/services/shared_markers.rb

@@ -2,6 +2,7 @@ module SharedMarkers
   include ActionView::Helpers::TagHelper
 
   def autolink(link, _link_type)
+    begin
       href = if ALLOWED_HOSTS_IN_MARKDOWN.include?(URI(link).host)
               link
             else
@@ -9,5 +10,8 @@ module SharedMarkers
             end
       
       content_tag(:a, link, href: href, target: "_blank", rel: "nofollow")
+    rescue
+      link
+    end
   end
 end