diff -r e41969a43e42 -r a9bc19e23c36 protocols/ircv3/purpleircv3messagehandlers.c
--- a/protocols/ircv3/purpleircv3messagehandlers.c	Thu Apr 24 21:42:59 2025 -0500
+++ b/protocols/ircv3/purpleircv3messagehandlers.c	Thu Apr 24 22:19:39 2025 -0500
@@ -430,13 +430,23 @@
 				purple_contact_manager_add(manager, contact);
 			}
 
-			member = purple_conversation_members_add_member(new_members,
-			                                                PURPLE_CONTACT_INFO(contact),
-			                                                FALSE, NULL);
+			/* Check if the member is already in the existing members list.
+			 * This can happen if the user sends a NAMES command and surely
+			 * other ways are possible. */
+			member = purple_conversation_members_find_member(existing_members,
+			                                                 PURPLE_CONTACT_INFO(contact));
+
+			/* If the member doesn't exist, add them. */
+			if(!PURPLE_IS_CONVERSATION_MEMBER(member)) {
+				member = purple_conversation_members_add_member(new_members,
+				                                                PURPLE_CONTACT_INFO(contact),
+				                                                FALSE, NULL);
+			}
 
 			purple_ircv3_add_badges_to_member(member, client, nick);
 
 			g_free(stripped);
+			g_clear_object(&contact);
 		}
 
 		purple_conversation_members_extend(existing_members, new_members);