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-rw-r--r--libguile/stacks.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/stacks.c b/libguile/stacks.c
index 3f3f132ce..c3ea624ce 100644
--- a/libguile/stacks.c
+++ b/libguile/stacks.c
@@ -276,6 +276,7 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1,
/* FIXME: is this even possible? */
if (scm_is_true (frame)
+ && SCM_PROGRAM_P (scm_frame_procedure (frame))
&& SCM_PROGRAM_IS_BOOT (scm_frame_procedure (frame)))
frame = scm_frame_previous (frame);