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| -rw-r--r-- | Modules/_collectionsmodule.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c index 5db7aed377..d9df5749e1 100644 --- a/Modules/_collectionsmodule.c +++ b/Modules/_collectionsmodule.c @@ -595,6 +595,9 @@ deque_clear(dequeobject *deque) Py_ssize_t n; PyObject *item; + if (Py_SIZE(deque) == 0) + return; + /* During the process of clearing a deque, decrefs can cause the deque to mutate. To avoid fatal confusion, we have to make the deque empty before clearing the blocks and never refer to |