diff --git a/app/services/sources_service.rb b/app/services/sources_service.rb
index aa95d382..e5857b52 100644
--- a/app/services/sources_service.rb
+++ b/app/services/sources_service.rb
@@ -171,7 +171,8 @@ class SourcesService
 
   def get_user_info params
     user = User.find params[:id]
-    {username: user.show_real_name, user_id: user.id, email: user.mail, phone: user.phone, sex: user.sex, school_name: user.school_name}
+    mail = user.mail.presence || "login@educoder.net"
+    {username: user.show_real_name, user_id: user.id, email: mail, phone: user.phone, sex: user.sex, school_name: user.school_name}
   end
 
   # courses start ############################################