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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 133f313..fdddc19 100644
--- a/Modules/hashtable.c
+++ b/Modules/hashtable.c
@@ -327,7 +327,8 @@ _Py_hashtable_set(_Py_hashtable_t *ht, const void *key,
entry->key_hash = key_hash;
assert(data_size == ht->data_size);
- memcpy(_Py_HASHTABLE_ENTRY_DATA(entry), data, data_size);
+ if (data)
+ memcpy(_Py_HASHTABLE_ENTRY_DATA(entry), data, data_size);
_Py_slist_prepend(&ht->buckets[index], (_Py_slist_item_t*)entry);
ht->entries++;