diff --git a/lib/sequencer/unit/import/freshdesk/conversation/mapping.rb b/lib/sequencer/unit/import/freshdesk/conversation/mapping.rb
index bea8a6b36..d80b0f58e 100644
--- a/lib/sequencer/unit/import/freshdesk/conversation/mapping.rb
+++ b/lib/sequencer/unit/import/freshdesk/conversation/mapping.rb
@@ -8,27 +8,33 @@ class Sequencer
 
             uses :resource, :id_map
 
-            SOURCE_MAP = {
-              0  => ::Ticket::Article::Type.select(:id).find_by(name: 'email').id, # Reply
-              1  => ::Ticket::Article::Type.select(:id).find_by(name: 'email').id, # Email
-              2  => ::Ticket::Article::Type.select(:id).find_by(name: 'web').id, # Note
-              3  => ::Ticket::Article::Type.select(:id).find_by(name: 'phone').id, # Phone
-              4  => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # UNKNOWN!
-              5  => ::Ticket::Article::Type.select(:id).find_by(name: 'twitter status').id, # Created from tweets
-              6  => ::Ticket::Article::Type.select(:id).find_by(name: 'web').id, # Created from survey feedback
-              7  => ::Ticket::Article::Type.select(:id).find_by(name: 'facebook feed post').id, # Created from Facebook post
-              8  => ::Ticket::Article::Type.select(:id).find_by(name: 'email').id, # Created from Forwarded Email
-              9  => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # Created from Phone
-              10 => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # Created from Mobihelp
-              11 => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # E-Commerce
-            }.freeze
+            # Since the imports rely on a fresh Zammad installation, we
+            #   can require the default article types and senders to be present.
+            def source_map # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
+              @source_map ||= {
+                0  => ::Ticket::Article::Type.select(:id).find_by(name: 'email')&.id, # Reply
+                1  => ::Ticket::Article::Type.select(:id).find_by(name: 'email')&.id, # Email
+                2  => ::Ticket::Article::Type.select(:id).find_by(name: 'web')&.id, # Note
+                3  => ::Ticket::Article::Type.select(:id).find_by(name: 'phone')&.id, # Phone
+                4  => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # UNKNOWN!
+                5  => ::Ticket::Article::Type.select(:id).find_by(name: 'twitter status')&.id, # Created from tweets
+                6  => ::Ticket::Article::Type.select(:id).find_by(name: 'web')&.id, # Created from survey feedback
+                7  => ::Ticket::Article::Type.select(:id).find_by(name: 'facebook feed post')&.id, # Created from Facebook post
+                8  => ::Ticket::Article::Type.select(:id).find_by(name: 'email')&.id, # Created from Forwarded Email
+                9  => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # Created from Phone
+                10 => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # Created from Mobihelp
+                11 => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # E-Commerce
+              }.freeze
+            end
 
-            INCOMING_MAP = {
-              true  => ::Ticket::Article::Sender.select(:id).find_by(name: 'Customer').id,
-              false => ::Ticket::Article::Sender.select(:id).find_by(name: 'Agent').id,
-            }.freeze
+            def incoming_map
+              @incoming_map ||= {
+                true  => ::Ticket::Article::Sender.select(:id).find_by(name: 'Customer')&.id,
+                false => ::Ticket::Article::Sender.select(:id).find_by(name: 'Agent')&.id,
+              }.freeze
+            end
 
-            def process  # rubocop:disable Metrics/AbcSize
+            def process # rubocop:disable Metrics/AbcSize
               provide_mapped do
                 {
                   from:          resource['from_email'],
@@ -41,8 +47,8 @@ class Sequencer
                   message_id:    resource['id'],
                   updated_by_id: user_id,
                   created_by_id: user_id,
-                  sender_id:     INCOMING_MAP[ resource['incoming'] ],
-                  type_id:       SOURCE_MAP[ resource['source'] ],
+                  sender_id:     incoming_map[ resource['incoming'] ],
+                  type_id:       source_map[ resource['source'] ],
                   created_at:    resource['created_at'],
                   updated_at:    resource['updated_at'],
                 }
diff --git a/lib/sequencer/unit/import/freshdesk/description/mapping.rb b/lib/sequencer/unit/import/freshdesk/description/mapping.rb
index 725d930fa..befb9298f 100644
--- a/lib/sequencer/unit/import/freshdesk/description/mapping.rb
+++ b/lib/sequencer/unit/import/freshdesk/description/mapping.rb
@@ -8,20 +8,24 @@ class Sequencer
 
             uses :resource, :id_map
 
-            SOURCE_MAP = {
-              0  => ::Ticket::Article::Type.select(:id).find_by(name: 'email').id, # Reply
-              1  => ::Ticket::Article::Type.select(:id).find_by(name: 'email').id, # Email
-              2  => ::Ticket::Article::Type.select(:id).find_by(name: 'web').id, # Note
-              3  => ::Ticket::Article::Type.select(:id).find_by(name: 'phone').id, # Phone
-              4  => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # UNKNOWN!
-              5  => ::Ticket::Article::Type.select(:id).find_by(name: 'twitter status').id, # Created from tweets
-              6  => ::Ticket::Article::Type.select(:id).find_by(name: 'web').id, # Created from survey feedback
-              7  => ::Ticket::Article::Type.select(:id).find_by(name: 'facebook feed post').id, # Created from Facebook post
-              8  => ::Ticket::Article::Type.select(:id).find_by(name: 'email').id, # Created from Forwarded Email
-              9  => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # Created from Phone
-              10 => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # Created from Mobihelp
-              11 => ::Ticket::Article::Type.select(:id).find_by(name: 'note').id, # E-Commerce
-            }.freeze
+            # Since the imports rely on a fresh Zammad installation, we
+            #   can require the default article types to be present.
+            def source_map # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
+              @source_map ||= {
+                0  => ::Ticket::Article::Type.select(:id).find_by(name: 'email')&.id, # Reply
+                1  => ::Ticket::Article::Type.select(:id).find_by(name: 'email')&.id, # Email
+                2  => ::Ticket::Article::Type.select(:id).find_by(name: 'web')&.id, # Note
+                3  => ::Ticket::Article::Type.select(:id).find_by(name: 'phone')&.id, # Phone
+                4  => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # UNKNOWN!
+                5  => ::Ticket::Article::Type.select(:id).find_by(name: 'twitter status')&.id, # Created from tweets
+                6  => ::Ticket::Article::Type.select(:id).find_by(name: 'web')&.id, # Created from survey feedback
+                7  => ::Ticket::Article::Type.select(:id).find_by(name: 'facebook feed post')&.id, # Created from Facebook post
+                8  => ::Ticket::Article::Type.select(:id).find_by(name: 'email')&.id, # Created from Forwarded Email
+                9  => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # Created from Phone
+                10 => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # Created from Mobihelp
+                11 => ::Ticket::Article::Type.select(:id).find_by(name: 'note')&.id, # E-Commerce
+              }.freeze
+            end
 
             def process # rubocop:disable Metrics/AbcSize
               provide_mapped do
@@ -35,7 +39,7 @@ class Sequencer
                   internal:      false,
                   message_id:    "ticketid#{resource['id']}@freshdesk.com",
                   sender_id:     ::Ticket::Article::Sender.select(:id).find_by(name: 'Customer').id,
-                  type_id:       SOURCE_MAP[ resource['source'] ],
+                  type_id:       source_map[ resource['source'] ],
                   updated_by_id: requester_id,
                   created_by_id: requester_id,
                   created_at:    resource['created_at'],
diff --git a/lib/sequencer/unit/import/freshdesk/ticket/mapping.rb b/lib/sequencer/unit/import/freshdesk/ticket/mapping.rb
index a032461ac..ad557e8c8 100644
--- a/lib/sequencer/unit/import/freshdesk/ticket/mapping.rb
+++ b/lib/sequencer/unit/import/freshdesk/ticket/mapping.rb
@@ -8,19 +8,25 @@ class Sequencer
 
             uses :resource, :id_map
 
-            PRIORITY_MAP = {
-              1 => ::Ticket::Priority.find_by(name: '1 low').id, # low
-              2 => ::Ticket::Priority.find_by(name: '2 normal').id, # medium
-              3 => ::Ticket::Priority.find_by(name: '3 high').id, # high
-              4 => ::Ticket::Priority.find_by(name: '3 high').id, # urgent
-            }.freeze
+            # Since the imports rely on a fresh Zammad installation, we
+            #   can require the default priority and state names to be present.
+            def priority_map
+              @priority_map ||= {
+                1 => ::Ticket::Priority.find_by(name: '1 low')&.id, # low
+                2 => ::Ticket::Priority.find_by(name: '2 normal')&.id, # medium
+                3 => ::Ticket::Priority.find_by(name: '3 high')&.id, # high
+                4 => ::Ticket::Priority.find_by(name: '3 high')&.id, # urgent
+              }.freeze
+            end
 
-            STATE_MAP = {
-              2 => ::Ticket::State.find_by(name: 'open').id, # open
-              3 => ::Ticket::State.find_by(name: 'open').id, # pending
-              4 => ::Ticket::State.find_by(name: 'closed').id, # resolved
-              5 => ::Ticket::State.find_by(name: 'closed').id, # closed
-            }.freeze
+            def state_map
+              @state_map ||= {
+                2 => ::Ticket::State.find_by(name: 'open')&.id, # open
+                3 => ::Ticket::State.find_by(name: 'open')&.id, # pending
+                4 => ::Ticket::State.find_by(name: 'closed')&.id, # resolved
+                5 => ::Ticket::State.find_by(name: 'closed')&.id, # closed
+              }.freeze
+            end
 
             def process # rubocop:disable Metrics/AbcSize
               provide_mapped do
@@ -28,8 +34,8 @@ class Sequencer
                   title:       resource['subject'],
                   number:      resource['id'],
                   group_id:    group_id,
-                  priority_id: PRIORITY_MAP[resource['priority']],
-                  state_id:    STATE_MAP[resource['status']],
+                  priority_id: priority_map[resource['priority']],
+                  state_id:    state_map[resource['status']],
                   owner_id:    owner_id,
                   customer_id: customer_id,
                   created_at:  resource['created_at'],