diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 8244c44cf..c383b2e0b 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -78,7 +78,12 @@ def description
         render json: {
           title: @attachment.title,
           description: @attachment.description,
-          author: @attachment.author.title,
+          author: 
+            if @attachment.author
+              @attachment.author.title
+            else
+              ''
+            end,
           html: render_to_string(partial: 'attachments/description', formats: [:html], locals: {attachment: @attachment})
         }
       end
diff --git a/app/mailers/post_mailer.rb b/app/mailers/post_mailer.rb
index 66f84ca16..2f014aeb4 100644
--- a/app/mailers/post_mailer.rb
+++ b/app/mailers/post_mailer.rb
@@ -35,7 +35,14 @@ def post_email(text, recipients, subject, sender, group, post)
 
     I18n.with_locale(recipients.first.try(:locale) || I18n.default_locale) do
       message = mail(
-        to: @to_field, from: sender.email, subject: subject,
+        to: @to_field, 
+        from: 
+          if sender.kind_of? User 
+            sender.email
+          elsif sender.kind_of? String 
+            sender
+          end, 
+        subject: subject,
         reply_to: @reply_to
       )
       message.smtp_envelope_to = @smtp_envelope_to_field
diff --git a/app/models/event.rb b/app/models/event.rb
index 7e1bee65f..e35446b90 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -16,7 +16,11 @@ def title
   end
   
   def to_param
-    "#{id} #{name} #{start_at.year}-#{start_at.month}-#{start_at.day}".parameterize
+    if start_at
+      "#{id} #{name} #{start_at.year}-#{start_at.month}-#{start_at.day}".parameterize
+    else
+      "#{id} #{name}".parameterize
+    end
   end
 
 
diff --git a/app/views/search/_preview_officer_group.html.haml b/app/views/search/_preview_officer_group.html.haml
index d7d75517b..f1f653e71 100644
--- a/app/views/search/_preview_officer_group.html.haml
+++ b/app/views/search/_preview_officer_group.html.haml
@@ -5,9 +5,9 @@
 - obj.memberships.includes(:descendant).each do |membership|
   %p
     = link_to membership.user.title, membership.user
-    = "(#{t(:since)} #{localize membership.valid_from.to_date})"
+    = "(#{t(:since)} #{localize membership.valid_from.to_date if membership.valid_from})"
 
 - if obj.scope # which is the object the officer is officer for.
   %p
     = "#{t(:see_also)}:"
-    = link_to obj.scope.title, obj.scope
\ No newline at end of file
+    = link_to obj.scope.title, obj.scope