Make WeakMap safe for compaction during allocation

During allocation, the table may not have been allocated yet which would
crash in the st_foreach.

1 files changed, 3 insertions, 1 deletions

diff --git a/weakmap.c b/weakmap.c
index 6d66181ffc..4e568e676b 100644
--- a/weakmap.c
+++ b/weakmap.c
@@ -144,7 +144,9 @@ wmap_compact(void *ptr)
 {
     struct weakmap *w = ptr;
 
-    st_foreach(w->table, wmap_compact_table_i, (st_data_t)w->table);
+    if (w->table) {
+        st_foreach(w->table, wmap_compact_table_i, (st_data_t)w->table);
+    }
 }
 
 static const rb_data_type_t weakmap_type = {