Index: app/controllers/members_controller.rb
===================================================================
--- app/controllers/members_controller.rb	(revision 13127)
+++ app/controllers/members_controller.rb	(working copy)
@@ -95,7 +95,7 @@
 
   def destroy
     if request.delete? && @member.deletable?
-      @member.destroy
+      @member.roles.destroy_all
     end
     respond_to do |format|
       format.html { redirect_to_settings_in_projects }