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-rw-r--r--libguile/dynwind.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/dynwind.c b/libguile/dynwind.c
index 8b6fedd70..be2084af7 100644
--- a/libguile/dynwind.c
+++ b/libguile/dynwind.c
@@ -156,7 +156,7 @@ typedef struct guardsmem {
#define SCM_BEFORE_GUARD(obj) (SCM_GUARDSMEM (obj)->before)
#define SCM_AFTER_GUARD(obj) (SCM_GUARDSMEM (obj)->after)
#define SCM_GUARD_DATA(obj) (SCM_GUARDSMEM (obj)->data)
-#define SCM_GUARDSP(obj) (SCM_CAR (obj) == tc16_guards)
+#define SCM_GUARDSP(obj) (SCM_NIMP(obj) && (SCM_CAR (obj) == tc16_guards))
static long tc16_guards;