(kom-list-clients) Select correct summary string when prefix is 0

src/commands1.el

@@ -3094,7 +3094,7 @@ prefix argument \(C-u -), list all sessions."
 				      (if (numberp prefix)
 					  'total-active-users
 					'total-users)
-				    (if (numberp prefix)
+				    (if (and (numberp prefix) (/= prefix 0))
 					'total-visible-active-users
 				      'total-visible-users))
 				  total-users