check for nil

ruby/lib/jam_ruby/models/user.rb

@@ -673,9 +673,11 @@ module JamRuby
         OnlinePresence.delete_all(["user_id = ?", self.id])
       end
 
-      online_presences.each do |op|
-        new_presence = OnlinePresence.create(self, op, false)      
-        self.online_presences << new_presence
+      unless online_presences.nil?
+        online_presences.each do |op|
+          new_presence = OnlinePresence.create(self, op, false)      
+          self.online_presences << new_presence
+        end
       end
     end
 
@@ -684,9 +686,11 @@ module JamRuby
         PerformanceSample.delete_all(["user_id = ?", self.id])
       end
 
-      performance_samples.each do |ps|
-        new_sample = PerformanceSample.create(self, ps, false)      
-        self.performance_samples << new_sample
+      unless performance_samples.nil?
+        performance_samples.each do |ps|
+          new_sample = PerformanceSample.create(self, ps, false)
+          self.performance_samples << new_sample
+        end
       end
     end