diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index cc337f0..b123623 100755
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
-echo "${CRONTAB}" > /crontabs/root
+if [ ! -z "${CRONTAB}" ] ; then
+    echo "${CRONTAB}" > /crontabs/roota
+fi
 
 /usr/sbin/crond -f -d8 -L /var/log/cron.log -c /crontabs