fix

custom_components/stiebel_eltron_isg/config_flow.py

@@ -29,7 +29,7 @@
 def host_valid(host):
     """Return True if hostname or IP address is valid."""
     try:
-        if ipaddress.ip_address(host) in (4, 6):
+        if ipaddress.ip_address(host).version in (4, 6):
             return True
     except ValueError:
         disallowed = re.compile(r"[^a-zA-Z\d\-]")