From a05f32c4c0a9405c54af134e9e2632f5f30dfffb Mon Sep 17 00:00:00 2001
From: Giuseppe Criscione <giuseppe.criscione@chialab.it>
Date: Wed, 1 Oct 2025 14:54:34 +0200
Subject: [PATCH] Allow zero as first level start number

---
 src/file/numbering/numbering.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/file/numbering/numbering.ts b/src/file/numbering/numbering.ts
index 3e34a0d7aa5..22c67943c0b 100644
--- a/src/file/numbering/numbering.ts
+++ b/src/file/numbering/numbering.ts
@@ -202,7 +202,7 @@ export class Numbering extends XmlComponent {
             reference,
             instance,
             overrideLevels: [
-                firstLevelStartNumber && Number.isInteger(firstLevelStartNumber)
+                typeof firstLevelStartNumber === "number" && Number.isInteger(firstLevelStartNumber)
                     ? {
                           num: 0,
                           start: firstLevelStartNumber,