Fix (next-frame nil t) crash (Bug#24281)

* src/frame.c (candidate_frame): Check minibuf argument before
comparing it to zero (Bug#24281).

diff --git a/src/frame.c b/src/frame.c
index e17c8acfc3cda14e9702ea40755f526ba04129c3..2dbbb37289b98a6446a5793638a047437f45a784 100644 (file)
--- a/src/frame.c
+++ b/src/frame.c
@@ -1310,7 +1310,7 @@ candidate_frame (Lisp_Object candidate, Lisp_Object frame, Lisp_Object minibuf)
                     FRAME_FOCUS_FRAME (c)))
            return candidate;
        }
-      else if (XFASTINT (minibuf) == 0)
+      else if (INTEGERP (minibuf) && XINT (minibuf) == 0)
        {
          if (FRAME_VISIBLE_P (c) || FRAME_ICONIFIED_P (c))
            return candidate;