diff --git a/legacy/ecore/src/lib/ecore_x/ecore_x_netwm.c b/legacy/ecore/src/lib/ecore_x/ecore_x_netwm.c
index 8175ae15ea..feb880fd82 100644
--- a/legacy/ecore/src/lib/ecore_x/ecore_x_netwm.c
+++ b/legacy/ecore/src/lib/ecore_x/ecore_x_netwm.c
@@ -1352,6 +1352,8 @@ ecore_x_netwm_sync_request_send(Ecore_X_Window win, unsigned int serial)
    XSyncValue value;
    XEvent xev;
 
+   if (!win) return;
+
    XSyncIntToValue(&value, serial);
 
    xev.xclient.type = ClientMessage;