Fixed disconnecting before Clear().
diff --git a/python/map.c b/python/map.c
index 0477c59..5f233b5 100644
--- a/python/map.c
+++ b/python/map.c
@@ -105,6 +105,14 @@
void PyUpb_MapContainer_Reify(PyObject* _self, upb_map* map) {
PyUpb_MapContainer* self = (PyUpb_MapContainer*)_self;
+ if (!map) {
+ const upb_fielddef* f = PyUpb_MapContainer_GetField(self);
+ upb_arena* arena = PyUpb_Arena_Get(self->arena);
+ const upb_msgdef* entry_m = upb_fielddef_msgsubdef(f);
+ const upb_fielddef* key_f = upb_msgdef_field(entry_m, 0);
+ const upb_fielddef* val_f = upb_msgdef_field(entry_m, 1);
+ map = upb_map_new(arena, upb_fielddef_type(key_f), upb_fielddef_type(val_f));
+ }
PyUpb_ObjCache_Add(map, &self->ob_base);
Py_DECREF(self->ptr.parent);
self->ptr.map = map; // Overwrites self->ptr.parent.
