diff --git a/core/smn_player.cpp b/core/smn_player.cpp
index 0d46b02b..76ef0750 100644
--- a/core/smn_player.cpp
+++ b/core/smn_player.cpp
@@ -98,7 +98,13 @@ static cell_t sm_GetClientAuthStr(IPluginContext *pCtx, const cell_t *params)
 		return pCtx->ThrowNativeError("Client %d is not connected.", index);
 	}
 
+	if (!pPlayer->IsAuthorized())
+	{
+		return 0;
+	}
+
 	pCtx->StringToLocal(params[2], static_cast<size_t>(params[3]), pPlayer->GetAuthString());
+
 	return 1;
 }