* window.c (Fprevious_window): Use FRAME_HAS_MINIBUF_P to decide

	if the frame has a minibuffer; FRAME_MINIBUF_WINDOW points to the
	surrogate on minibufferless frames, not nil.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/window.c b/src/window.c
index 96606a8aa6d..655515182ce 100644
--- a/src/window.c
+++ b/src/window.c
@@ -978,8 +978,9 @@ windows, eventually ending up back at the window you started with.\n\
 #endif
             /* If this frame has a minibuffer, find that window first,
                because it is conceptually the last window in that frame.  */
-            tem = FRAME_MINIBUF_WINDOW (XFRAME (tem));
-            if (NILP (tem))
+            if (FRAME_HAS_MINIBUF_P (XFRAME (tem)))
+              tem = FRAME_MINIBUF_WINDOW (XFRAME (tem));
+            else
               tem = FRAME_ROOT_WINDOW (XFRAME (tem));
 
             break;