From 10caca25c92d95ca52889207c926f38ef5fdc154 Mon Sep 17 00:00:00 2001
From: Jussi Saurio <jussi.saurio@gmail.com>
Date: Tue, 10 Jun 2025 11:29:02 +0300
Subject: [PATCH] advance in balance_non_root() if -1 idx

---
 core/storage/btree.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/storage/btree.rs b/core/storage/btree.rs
index 2b08a21ac..a9543b2f6 100644
--- a/core/storage/btree.rs
+++ b/core/storage/btree.rs
@@ -2322,6 +2322,10 @@ impl BTreeCursor {
                     == parent_page.get_contents().cell_count() + 1
                 {
                     self.stack.retreat();
+                } else if self.stack.current_cell_index() == -1 {
+                    // We might've retreated in CheckRequiresBalancing, so advance to the next cell
+                    // to prevent panic in the asserts below due to -1 index
+                    self.stack.advance();
                 }
                 parent_page.set_dirty();
                 self.pager.add_dirty(parent_page.get().id);