diff --git a/scripts/crontab/crontab_clear.sh b/scripts/crontab/crontab_clear.sh
index a85d3d4..7579c99 100755
--- a/scripts/crontab/crontab_clear.sh
+++ b/scripts/crontab/crontab_clear.sh
@@ -1,8 +1,13 @@
 #!/bin/bash
 
 # Function to remove all crontab data
-crontabClear() 
+crontabClear()
 {
-    echo "" | sudo -u $sudo_user_name crontab -
+    # Remove the install user's crontab as root so a stale spool file owned by
+    # a defunct UID is cleared too — e.g. after the EasyDocker -> LibrePortal
+    # user rename. The sticky bit on /var/spool/cron/crontabs otherwise stops
+    # the user replacing a file it doesn't own ("rename: Operation not
+    # permitted"); setup recreates the crontab as the user next.
+    sudo crontab -u "$sudo_user_name" -r 2>/dev/null
     isSuccessful "All crontab data has been deleted."
 }
\ No newline at end of file