@@ -348,7 +348,7 @@ function ensure_certificates {

     local key=${!key_var}

     local ca=${!ca_var}

-    if [[ !($cert && $key && $ca) ]]; then

+    if [[ -z "$cert" || -z "$key" || -z "$ca" ]]; then

         die $LINENO "Missing either the ${cert_var} ${key_var} or ${ca_var}" \

                     "variable to enable SSL for ${service}"

     fi