diff --git a/core/PlayerManager.cpp b/core/PlayerManager.cpp
index 9eb23a50..f53e9c34 100644
--- a/core/PlayerManager.cpp
+++ b/core/PlayerManager.cpp
@@ -199,7 +199,10 @@ void PlayerManager::OnServerActivate(edict_t *pEdictList, int edictCount, int cl
 	List<IClientListener *>::iterator iter;
 	for (iter = m_hooks.begin; iter != m_hooks.end(); iter++)
 	{
-		(*iter)->OnServerActivated(clientMax);
+		if ((*iter)->GetClientListenerVersion() >= 5)
+		{
+			(*iter)->OnServerActivated(clientMax);
+		}
 	}
 
 	g_OnMapStarted = true;
diff --git a/public/IPlayerHelpers.h b/public/IPlayerHelpers.h
index bf02dcf3..0071d93d 100644
--- a/public/IPlayerHelpers.h
+++ b/public/IPlayerHelpers.h
@@ -277,6 +277,8 @@ namespace SourceMod
 		/**
 		 * @brief Returns the maximum number of clients.
 		 *
+		 * Note: this will not work until the server is activated.
+		 *
 		 * @return				Maximum number of clients.
 		 */
 		virtual int GetMaxClients() =0;