diff --git a/app/site.rb b/app/site.rb
index 7e6654f0..92f061ed 100644
--- a/app/site.rb
+++ b/app/site.rb
@@ -18,6 +18,7 @@ get '/site/:username/?' do |username|
   @current_page = 1 if @current_page == 0
 
   if params[:event_id]
+    not_found unless params[:is_integer].is_integer?
     event = Event.select(:id).where(id: params[:event_id]).first
     not_found if event.nil?
     events_dataset = Event.where(id: params[:event_id]).paginate(1, 1)
diff --git a/ext/string.rb b/ext/string.rb
index 12ec0af1..d4954f6f 100644
--- a/ext/string.rb
+++ b/ext/string.rb
@@ -11,4 +11,8 @@ class String
   def unindent
     gsub /^#{scan(/^\s*/).min_by{|l|l.length}}/, ""
   end
+
+  def is_integer?
+    true if Integer(self) rescue false
+  end
 end