(XTread_socket): Fix previous change in case F == 0.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/xterm.c b/src/xterm.c
index a63fdafb836..573f11c15c3 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -4570,7 +4570,8 @@ XTread_socket (sd, bufp, numchars, expected)
                        before this event; any subsequent mouse-movement
                        Emacs events should reflect only motion after
                        the ButtonPress.  */
-                    f->mouse_moved = 0;
+                    if (f != 0)
+                      f->mouse_moved = 0;
                   }
                 else
                   {