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-rw-r--r--include/mruby/khash.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/mruby/khash.h b/include/mruby/khash.h
index a2e6ef6f7..f735d2639 100644
--- a/include/mruby/khash.h
+++ b/include/mruby/khash.h
@@ -193,6 +193,7 @@ kh_fill_flags(uint8_t *p, uint8_t c, size_t len)
void kh_del_##name(mrb_state *mrb, kh_##name##_t *h, khint_t x) \
{ \
(void)mrb; \
+ mrb_assert(x != h->n_buckets && !__ac_iseither(h->ed_flags, x)); \
h->ed_flags[x/4] |= __m_del[x%4]; \
h->size--; \
} \