diff --git a/preconf.sh b/preconf.sh
index 68f2369..c84d679 100644
--- a/preconf.sh
+++ b/preconf.sh
@@ -1,6 +1,6 @@
 mrepo=https://git.bprieshof.nl/Work/Test-MySQL
 mbranch=master
-CurDebFrond="$DEBIAN_FRONTEND"
+if [ -z ${DEBIAN_FRONTEND+x} ]; then echo 'env not set' ; else CurDebFrond="$DEBIAN_FRONTEND"; fi #checking and saving DEBIAN_FRONTEND
 export DEBIAN_FRONTEND=noninteractive
 
 if [ -z ${password+x} ]; then echo 'Error $password is not set'; fi
@@ -22,6 +22,6 @@ wget -q -t7 https://dev.mysql.com/get/mysql-apt-config_0.8.13-1_all.deb -O /tmp/
 dpkg -i /tmp/mysql-apt-conf.deb > $OUTPUT 2>&1
 
 
-export DEBIAN_FRONTEND=$CurDebFrond
+if [ -z ${CurDebFrond+x} ]; then unset DEBIAN_FRONTEND ; else export DEBIAN_FRONTEND=$CurDebFrond; fi #Restore DEBIAN_FRONTEND
 unset mrepo
 unset mbranch
\ No newline at end of file