diff --git a/app/views/notification_mailer/_status.html.haml b/app/views/notification_mailer/_status.html.haml
index d8aa38b112..4ea3d2c45e 100644
--- a/app/views/notification_mailer/_status.html.haml
+++ b/app/views/notification_mailer/_status.html.haml
@@ -42,4 +42,4 @@
                                         = link_to a.remote_url, a.remote_url
 
                               %p.status-footer
-                                = link_to l(status.created_at.in_time_zone(time_zone)), web_url("@#{status.account.pretty_acct}/#{status.id}")
+                                = link_to l(status.created_at.in_time_zone(time_zone.presence)), web_url("@#{status.account.pretty_acct}/#{status.id}")
diff --git a/app/views/user_mailer/appeal_approved.html.haml b/app/views/user_mailer/appeal_approved.html.haml
index d62789a067..1bbd8ae75a 100644
--- a/app/views/user_mailer/appeal_approved.html.haml
+++ b/app/views/user_mailer/appeal_approved.html.haml
@@ -36,7 +36,7 @@
                         %tbody
                           %tr
                             %td.column-cell.text-center
-                              %p= t 'user_mailer.appeal_approved.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone))
+                              %p= t 'user_mailer.appeal_approved.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone.presence)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone.presence))
 
 %table.email-table{ cellspacing: 0, cellpadding: 0 }
   %tbody
diff --git a/app/views/user_mailer/appeal_approved.text.erb b/app/views/user_mailer/appeal_approved.text.erb
index 99596605aa..9a4bd81c3d 100644
--- a/app/views/user_mailer/appeal_approved.text.erb
+++ b/app/views/user_mailer/appeal_approved.text.erb
@@ -2,6 +2,6 @@
 
 ===
 
-<%= t 'user_mailer.appeal_approved.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone)) %>
+<%= t 'user_mailer.appeal_approved.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone.presence)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone.presence)) %>
 
 => <%= root_url %>
diff --git a/app/views/user_mailer/appeal_rejected.html.haml b/app/views/user_mailer/appeal_rejected.html.haml
index ae60775b01..22e3f62df6 100644
--- a/app/views/user_mailer/appeal_rejected.html.haml
+++ b/app/views/user_mailer/appeal_rejected.html.haml
@@ -36,7 +36,7 @@
                         %tbody
                           %tr
                             %td.column-cell.text-center
-                              %p= t 'user_mailer.appeal_rejected.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone))
+                              %p= t 'user_mailer.appeal_rejected.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone.presence)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone.presence))
 
 %table.email-table{ cellspacing: 0, cellpadding: 0 }
   %tbody
diff --git a/app/views/user_mailer/appeal_rejected.text.erb b/app/views/user_mailer/appeal_rejected.text.erb
index 3c93777180..3b063e19df 100644
--- a/app/views/user_mailer/appeal_rejected.text.erb
+++ b/app/views/user_mailer/appeal_rejected.text.erb
@@ -2,6 +2,6 @@
 
 ===
 
-<%= t 'user_mailer.appeal_rejected.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone)) %>
+<%= t 'user_mailer.appeal_rejected.explanation', appeal_date: l(@appeal.created_at.in_time_zone(@resource.time_zone.presence)), strike_date: l(@appeal.strike.created_at.in_time_zone(@resource.time_zone.presence)) %>
 
 => <%= root_url %>
diff --git a/app/views/user_mailer/suspicious_sign_in.html.haml b/app/views/user_mailer/suspicious_sign_in.html.haml
index 6ebba3fa55..3dbec61ffe 100644
--- a/app/views/user_mailer/suspicious_sign_in.html.haml
+++ b/app/views/user_mailer/suspicious_sign_in.html.haml
@@ -47,7 +47,7 @@
                                 %strong= "#{t('sessions.browser')}:"
                                 %span{ title: @user_agent }= t 'sessions.description', browser: t("sessions.browsers.#{@detection.id}", default: @detection.id.to_s), platform: t("sessions.platforms.#{@detection.platform.id}", default: @detection.platform.id.to_s)
                                 %br/
-                                = l(@timestamp.in_time_zone(@resource.time_zone))
+                                = l(@timestamp.in_time_zone(@resource.time_zone.presence))
 
 %table.email-table{ cellspacing: 0, cellpadding: 0 }
   %tbody
diff --git a/app/views/user_mailer/suspicious_sign_in.text.erb b/app/views/user_mailer/suspicious_sign_in.text.erb
index 956071e774..ed01e54fa2 100644
--- a/app/views/user_mailer/suspicious_sign_in.text.erb
+++ b/app/views/user_mailer/suspicious_sign_in.text.erb
@@ -8,7 +8,7 @@
 
 <%= t('sessions.ip') %>: <%= @remote_ip %>
 <%= t('sessions.browser') %>: <%= t('sessions.description', browser: t("sessions.browsers.#{@detection.id}", default: "#{@detection.id}"), platform: t("sessions.platforms.#{@detection.platform.id}", default: "#{@detection.platform.id}")) %>
-<%= l(@timestamp.in_time_zone(@resource.time_zone)) %>
+<%= l(@timestamp.in_time_zone(@resource.time_zone.presence)) %>
 
 <%= t 'user_mailer.suspicious_sign_in.further_actions_html', action: t('user_mailer.suspicious_sign_in.change_password') %>
 
diff --git a/app/views/user_mailer/warning.html.haml b/app/views/user_mailer/warning.html.haml
index 9cb73b0fee..8a878bead6 100644
--- a/app/views/user_mailer/warning.html.haml
+++ b/app/views/user_mailer/warning.html.haml
@@ -58,7 +58,7 @@
 
 - unless @statuses.empty?
   - @statuses.each_with_index do |status, i|
-    = render 'notification_mailer/status', status: status, i: i + 1, highlighted: true, time_zone: @resource.time_zone
+    = render 'notification_mailer/status', status: status, i: i + 1, highlighted: true, time_zone: @resource.time_zone.presence
 
 %table.email-table{ cellspacing: 0, cellpadding: 0 }
   %tbody