diff --git a/btcpay-setup.sh b/btcpay-setup.sh
index 264385b..67a6bbc 100755
--- a/btcpay-setup.sh
+++ b/btcpay-setup.sh
@@ -74,11 +74,11 @@ if [ "$1" != "-i" ]; then
     return
 fi
 
-if [ -z "$BTCPAY_HOST" ]; then
+if [ -z "$BTCPAYGEN_CRYPTO1" ]; then
     if [ -f "/etc/profile.d/btcpay-env.sh" ]; then
         echo "This script must be run as root after running \"sudo su -\""
     else
-        echo "BTCPAY_HOST should not be empty"
+        echo "BTCPAYGEN_CRYPTO1 should not be empty"
     fi
     return
 fi
@@ -129,7 +129,7 @@ if [[ -f "$BTCPAY_HOST_SSHKEYFILE" ]]; then
     done
 fi
 
-if [[ "$BTCPAYGEN_REVERSEPROXY" == "nginx" ]]; then
+if [[ "$BTCPAYGEN_REVERSEPROXY" == "nginx" ]] && [[ "$BTCPAY_HOST" ]]; then
     DOMAIN_NAME="$(echo "$BTCPAY_HOST" | grep -P '(?=^.{4,253}$)(^(?:[a-zA-Z0-9](?:(?:[a-zA-Z0-9\-]){0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$)')"
     if [[ ! "$DOMAIN_NAME" ]]; then
         echo "BTCPAYGEN_REVERSEPROXY is set to nginx, so BTCPAY_HOST must be a domain name which point to this server (with port 80 and 443 open), but the current value of BTCPAY_HOST ('$BTCPAY_HOST') is not a valid domain name."