From 91c497ff13e20b6838cc4aa2b23d15f3f56fe0a9 Mon Sep 17 00:00:00 2001
From: DarkSky <darksky2048@gmail.com>
Date: Tue, 10 Oct 2023 17:28:43 +0800
Subject: [PATCH] chore: catch overflow

---
 libs/jwst-codec/src/doc/store.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/jwst-codec/src/doc/store.rs b/libs/jwst-codec/src/doc/store.rs
index 8126997c..89d9a973 100644
--- a/libs/jwst-codec/src/doc/store.rs
+++ b/libs/jwst-codec/src/doc/store.rs
@@ -615,7 +615,9 @@ impl DocStore {
         // 3. adjust parent length
         if item.parent_sub.is_none() && item.countable() {
             if let Some(parent) = parent {
-                parent.len -= item.len();
+                if parent.len != 0 {
+                    parent.len -= item.len();
+                }
             } else if let Some(Parent::Type(ty)) = &item.parent {
                 ty.ty_mut().unwrap().len -= item.len();
             }