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-rw-r--r--src/btree.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/btree.c b/src/btree.c
index f276e5f..093d0c3 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -680,6 +680,7 @@ zix_btree_fatten_child(ZixBTree* const t, ZixBTreeIter* const iter)
assert(n);
assert(!n->is_leaf);
+ assert(n->n_vals);
ZixBTreeNode* const* const children = n->data.inode.children;
if (i > 0U && zix_btree_can_remove_from(children[i - 1U])) {