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-rw-r--r--src/xselect.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/xselect.c b/src/xselect.c
index bf4fcb6d992..15a4c283b8b 100644
--- a/src/xselect.c
+++ b/src/xselect.c
@@ -2094,7 +2094,8 @@ DEFUN ("x-get-cut-buffer-internal", Fx_get_cut_buffer_internal,
x_get_window_property (display, window, buffer_atom, &data, &bytes,
&type, &format, &size, 0);
- if (!data) return Qnil;
+ if (!data || !format)
+ return Qnil;
if (format != 8 || type != XA_STRING)
Fsignal (Qerror,