(Finternal_set_lisp_face_attribute): Check if the frame

is on a window system before accessing the fontset of the frame.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/xfaces.c b/src/xfaces.c
index 51f13a30821..c2a5dd9d4a0 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -4540,6 +4540,7 @@ FRAME 0 means change the face on all frames, and change the default
 
 #ifdef USE_FONT_BACKEND
           if (enable_font_backend
+              && FRAME_WINDOW_P (XFRAME (frame))
               && !UNSPECIFIEDP (value) && !IGNORE_DEFFACE_P (value))
             {
               int fontset;