diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index 027f63fad..a3ee3a2d6 100644
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -248,7 +248,7 @@ SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relativ
 
     /* make sure that the pointers find themselves inside the windows,
        unless we have the mouse captured. */
-    if ((window->flags & SDL_WINDOW_MOUSE_CAPTURE) == 0) {
+    if (window != NULL && ((window->flags & SDL_WINDOW_MOUSE_CAPTURE) == 0)) {
         int x_max = 0, y_max = 0;
 
         // !!! FIXME: shouldn't this be (window) instead of (mouse->focus)?