diff --git a/app/views/events/index.ics.haml b/app/views/events/index.ics.haml
index f39491c6..9fd89dcb 100644
--- a/app/views/events/index.ics.haml
+++ b/app/views/events/index.ics.haml
@@ -5,9 +5,13 @@
   cal = Icalendar::Calendar.new
   @events.each do |event|
     tzid = event.region.tzid
-    tz = TZInfo::Timezone.get tzid
-    timezone = tz.ical_timezone event.start_time
-    cal.add_timezone timezone
+    begin
+      tz = TZInfo::Timezone.get tzid
+      timezone = tz.ical_timezone event.start_time
+      cal.add_timezone timezone
+    rescue TZInfo::InvalidTimezoneIdentifier
+      # No need to add this tz
+    end
 
     cal.event do |e|
       e.dtstamp     = Icalendar::Values::DateTime.new event.decision_time, tzid: tzid