diff --git a/podman-jitsi/10_install.sh b/podman-jitsi/10_install.sh
index 1ebf7f6..2533795 100755
--- a/podman-jitsi/10_install.sh
+++ b/podman-jitsi/10_install.sh
@@ -8,6 +8,7 @@ ensure_pwd_is_scriptdir
 ensure_not_root
 
 ensure_pod_not_exists ${pod_name}
+ensure_variables_are_defined "$envvars"
 
 if [[ -d ${confvolume} ]]; then
     echo "Error : conf volume ${confvolume} already exists. Please consider running 80_destroy.sh."
diff --git a/podman-jitsi/50_update.sh b/podman-jitsi/50_update.sh
index e7e0406..e64ba05 100755
--- a/podman-jitsi/50_update.sh
+++ b/podman-jitsi/50_update.sh
@@ -9,6 +9,7 @@ ensure_not_root
 
 ensure_pod_exists ${pod_name}
 ensure_systemd_unit_exists ${service_name}
+ensure_variables_are_defined "$envvars"
 
 current_version=$(podman container list -a --format "{{.Image}}" | grep prosody | awk -F: '{print $NF}')