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-rw-r--r--Modules/hashtable.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Modules/hashtable.c b/Modules/hashtable.c
index b53cc24..3462fef 100644
--- a/Modules/hashtable.c
+++ b/Modules/hashtable.c
@@ -338,7 +338,8 @@ _Py_hashtable_set(_Py_hashtable_t *ht, size_t key_size, const void *pkey,
entry->key_hash = key_hash;
Py_MEMCPY((void *)_Py_HASHTABLE_ENTRY_PKEY(entry), pkey, ht->key_size);
- ENTRY_WRITE_PDATA(ht, entry, data_size, data);
+ if (data)
+ ENTRY_WRITE_PDATA(ht, entry, data_size, data);
_Py_slist_prepend(&ht->buckets[index], (_Py_slist_item_t*)entry);
ht->entries++;