diff --git a/setup/webmail.sh b/setup/webmail.sh
index e1d0e609..37293d68 100644
--- a/setup/webmail.sh
+++ b/setup/webmail.sh
@@ -49,8 +49,8 @@ apt_install php"${PHP_VER}"-ldap
 #   https://github.com/mstilkerich/rcmcarddav/releases
 # The easiest way to get the package hashes is to run this script and get the hash from
 # the error message.
-VERSION=1.6.9
-HASH=b63f74209cf287402f6f44b85877388899261f3c
+VERSION=1.6.10
+HASH=0cfbb457e230793df8c56c2e6d3655cf3818f168
 PERSISTENT_LOGIN_VERSION=version-5.3.0
 HTML5_NOTIFIER_VERSION=68d9ca194212e15b3c7225eb6085dbcf02fd13d7 # version 0.6.4+
 CARDDAV_VERSION=4.4.3
diff --git a/tools/ssl_cleanup b/tools/ssl_cleanup
index 95f099de..e3f8d4de 100755
--- a/tools/ssl_cleanup
+++ b/tools/ssl_cleanup
@@ -11,7 +11,7 @@
 # Cleanup SSL certificates which expired more than 7 days ago from $STORAGE_ROOT/ssl and move them to $STORAGE_ROOT/ssl.expired
 
 source /etc/mailinabox.conf
-shopt -s extglob
+shopt -s extglob nullglob
 
 retain_after="$(date --date="7 days ago" +%Y%m%d)"