diff --git a/plugins/CustomVariables/Archiver.php b/plugins/CustomVariables/Archiver.php
index 0d4172c0db6487132a0d287120a6d89e84ce5ccd..241e2772a0a5ba211abbae293866f33e39a9151d 100644
--- a/plugins/CustomVariables/Archiver.php
+++ b/plugins/CustomVariables/Archiver.php
@@ -213,6 +213,7 @@ class Archiver extends \Piwik\Plugin\Archiver
             ) {
                 unset($row[Metrics::INDEX_NB_UNIQ_VISITORS]);
                 unset($row[Metrics::INDEX_NB_VISITS]);
+                unset($row[Metrics::INDEX_NB_USERS]);
             }
         }
     }