diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 3da8736ed..c001378b3 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -188,11 +188,6 @@ def eager_load
     ]
   end
 
-  def derived_col?(col_name:)
-    return true if col_name == 'area_list'
-    false
-  end
-
   def array_col?(col_name:)
     return true if col_name == 'area_list'
     false
diff --git a/docs/index.md b/docs/index.md
index 3b43ea959..54958b0f1 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -7,8 +7,8 @@ This software is open source! If you'd like to contribute, please email planoram
 
 [Planorama Data Privacy & Protection Policy](/planorama/privacy)
 
-Production version: 1.6.3
+Production version: 1.6.4
 
-Staging version: 1.6.3
+Staging version: 1.6.4
 
 <script type="text/javascript" src="https://chicon-planorama.atlassian.net/s/d41d8cd98f00b204e9800998ecf8427e-T/r5gghz/b/3/bc54840da492f9ca037209037ef0522a/_/download/batch/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector.js?locale=en-US&collectorId=816c99a7"></script>