Reworked to the functionality to import objects in the fetch loop instead of fetching all in the first place. Issue is caused by the Zendesk API or Gem. For more information see: https://github.com/zendesk/zendesk_api_client_rb/issues/290 .

lib/import/zendesk.rb

@@ -317,12 +317,7 @@ module Import::Zendesk
 
       local_fields = local_object.constantize.column_names
 
-      zendesk_object_fields = []
       @client.send("#{local_object.downcase}_fields").all { |zendesk_object_field|
-        zendesk_object_fields.push(zendesk_object_field)
-      }
-
-      zendesk_object_fields.each { |zendesk_object_field|
 
         if local_object == 'Ticket'
           mapped_object_field = method("mapping_#{local_object.downcase}_field").call( zendesk_object_field.type )
@@ -472,13 +467,7 @@ module Import::Zendesk
   def import_groups
 
     @zendesk_group_mapping = {}
-    zendesk_groups = []
     @client.groups.all { |zendesk_group|
-      zendesk_groups.push(zendesk_group)
-    }
-
-    zendesk_groups.each { |zendesk_group|
-
       local_group = Group.create_if_not_exists(
         name:          zendesk_group.name,
         active:        !zendesk_group.deleted,
@@ -526,12 +515,7 @@ module Import::Zendesk
     role_agent    = Role.lookup(name: 'Agent')
     role_customer = Role.lookup(name: 'Customer')
 
-    zendesk_users = []
     @client.users.all { |zendesk_user|
-      zendesk_users.push(zendesk_user)
-    }
-
-    zendesk_users.each { |zendesk_user|
 
       local_user_fields = {
         login:           zendesk_user.id.to_s, # Zendesk users may have no other identifier than the ID, e.g. twitter users
@@ -602,12 +586,7 @@ module Import::Zendesk
 
     @zendesk_user_group_mapping = {}
 
-    zendesk_group_memberships = []
     @client.group_memberships.all { |zendesk_group_membership|
-      zendesk_group_memberships.push(zendesk_group_membership)
-    }
-
-    zendesk_group_memberships.each { |zendesk_group_membership|
 
       @zendesk_user_group_mapping[ zendesk_group_membership.user_id ] ||= []
       @zendesk_user_group_mapping[ zendesk_group_membership.user_id ].push( zendesk_group_membership.group_id )
@@ -641,12 +620,7 @@ module Import::Zendesk
     article_type_facebook_feed_post    = Ticket::Article::Type.lookup(name: 'facebook feed post')
     article_type_facebook_feed_comment = Ticket::Article::Type.lookup(name: 'facebook feed comment')
 
-    zendesk_tickets = []
     @client.tickets.all { |zendesk_ticket|
-      zendesk_tickets.push(zendesk_ticket)
-    }
-
-    zendesk_tickets.each { |zendesk_ticket|
 
       zendesk_ticket_fields = {}
       zendesk_ticket.custom_fields.each { |zendesk_ticket_field|
@@ -840,12 +814,7 @@ module Import::Zendesk
   # https://developer.zendesk.com/rest_api/docs/core/macros
   def import_macros
 
-    zendesk_macros = []
     @client.macros.all { |zendesk_macro|
-      zendesk_macros.push(zendesk_macro)
-    }
-
-    zendesk_macros.each { |zendesk_macro|
 
       # TODO
       next if !zendesk_macro.active
@@ -897,12 +866,7 @@ module Import::Zendesk
   # https://developer.zendesk.com/rest_api/docs/core/views
   def import_views
 
-    zendesk_views = []
     @client.views.all { |zendesk_view|
-      zendesk_views.push(zendesk_view)
-    }
-
-    zendesk_views.each { |zendesk_view|
 
       # "url"         => "https://example.zendesk.com/api/v2/views/59511071.json"
       # "id"          => 59511071
@@ -1031,12 +995,7 @@ module Import::Zendesk
   # https://developer.zendesk.com/rest_api/docs/core/automations
   def import_automations
 
-    zendesk_automations = []
     @client.automations.all { |zendesk_automation|
-      zendesk_automations.push(zendesk_automation)
-    }
-
-    zendesk_automations.each { |zendesk_automation|
 
       # "url"        => "https://example.zendesk.com/api/v2/automations/60037892.json"
       # "id"         => 60037892