diff --git a/src/etc/inc/plugins.inc.d/core.inc b/src/etc/inc/plugins.inc.d/core.inc
index 37758699f..d295c2166 100644
--- a/src/etc/inc/plugins.inc.d/core.inc
+++ b/src/etc/inc/plugins.inc.d/core.inc
@@ -298,7 +298,7 @@ function core_cron()
     /**
      * rrd graph collector, only schedule execution when enabled
      */
-    if (!empty($config['rrd']['enable'])) {
+    if (isset($config['rrd']['enable'])) {
         $jobs[]['autocron'] = [
             '/usr/local/bin/flock -n -E 0 -o /tmp/updaterrd.lock /usr/local/opnsense/scripts/health/updaterrd.php',
             '*'