diff --git a/certbot-apache/certbot_apache/_internal/configurator.py b/certbot-apache/certbot_apache/_internal/configurator.py
index 67b89e788..8b09e0637 100644
--- a/certbot-apache/certbot_apache/_internal/configurator.py
+++ b/certbot-apache/certbot_apache/_internal/configurator.py
@@ -984,7 +984,9 @@ class ApacheConfigurator(common.Configurator):
         for arg in args:
             arg_value = self.parser.get_arg(arg)
             if arg_value is not None:
-                addrs.add(obj.Addr.fromstring(arg_value))
+                addr = obj.Addr.fromstring(arg_value)
+                if addr is not None:
+                    addrs.add(addr)
         is_ssl = False
 
         if self.parser.find_dir("SSLEngine", "on", start=path, exclude=False):
diff --git a/certbot/certbot/plugins/common.py b/certbot/certbot/plugins/common.py
index b8aa023d1..3af0ee6ec 100644
--- a/certbot/certbot/plugins/common.py
+++ b/certbot/certbot/plugins/common.py
@@ -261,7 +261,7 @@ class Addr:
         self.ipv6 = ipv6
 
     @classmethod
-    def fromstring(cls: Type[GenericAddr], str_addr: str) -> GenericAddr:
+    def fromstring(cls: Type[GenericAddr], str_addr: str) -> Optional[GenericAddr]:
         """Initialize Addr from string."""
         if str_addr.startswith('['):
             # ipv6 addresses starts with [