diff.diff

diff --git a/app/models/campaign.rb b/app/models/campaign.rb
index f1b12a5..7d54830 100644
--- a/app/models/campaign.rb
+++ b/app/models/campaign.rb
@@ -687,10 +687,13 @@ class Campaign < BaseModel
   end
 
   def expires_at_for_share
+    # If new share needs to be created in expired campaign
+    # we prepare only set it relatively to the campaign deactivation
+    start_time = active? ? Time.now : expires_at
     [
       # Rounded up to an hour, to reduce count of short_urls
       # and make share detection easier
-      offer_duration.present? ? (DateTime.now + offer_duration.hours).end_of_hour : nil,
+      offer_duration.present? ? (start_time + offer_duration.hours).end_of_hour : nil,
       friend_deadline,
     ].compact.min.try(:in_time_zone)
   end
@@ -858,18 +861,18 @@ protected