diff --git a/lib/xenu_nntp/session.py b/lib/xenu_nntp/session.py
index a8033ca..7d1923d 100644
--- a/lib/xenu_nntp/session.py
+++ b/lib/xenu_nntp/session.py
@@ -285,9 +285,7 @@ class Session(Connection):
 
         return self.end()
 
-    def print_newsgroup_summary(self, newsgroup: Newsgroup, since: Optional[datetime.datetime]=None):
-        summary = self._newsgroup_summary(newsgroup, since)
-
+    def print_newsgroup_summary(self, summary: dict):
         return self.print("%s %d %d %s" % (
             summary['name'],
             summary['min'],
@@ -330,7 +328,9 @@ class Session(Connection):
         self.respond(ResponseCode.NNTP_INFORMATION_FOLLOWS)
 
         for newsgroup in self.each_newsgroup():
-            self.print_newsgroup_summary(newsgroup)
+            summary = self._newsgroup_summary(newsgroup)
+
+            self.print_newsgroup_summary(summary)
 
         return self.end()
 
@@ -497,6 +497,11 @@ class Session(Connection):
         self.respond(ResponseCode.NNTP_GROUPS_NEW_FOLLOW)
 
         for newsgroup in self.each_newsgroup():
+            summary = self._newsgroup_summary(newsgroup, timestamp)
+
+            if summary['min'] is None:
+                continue
+
             self.print_newsgroup_summary(newsgroup, timestamp)
 
         return self.end()