From afe184ec78dcc8f780e64687e06670365beeb77e Mon Sep 17 00:00:00 2001
From: zhenggu_rkie <43308087+gz281620758@users.noreply.github.com>
Date: Thu, 22 Jan 2026 10:59:20 +0800
Subject: [PATCH] fix: the null value check issue in image spacing calculation
 (#5726)
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Co-authored-by: 顾争 <zheng.gu-rd@djhealthunion.com.cn>
Co-authored-by: Bill Wallace <wayfarer3130@gmail.com>
---
 .../default/src/utils/validations/areAllImageSpacingEqual.ts  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/extensions/default/src/utils/validations/areAllImageSpacingEqual.ts b/extensions/default/src/utils/validations/areAllImageSpacingEqual.ts
index 49906c3c2..d06cb1dac 100644
--- a/extensions/default/src/utils/validations/areAllImageSpacingEqual.ts
+++ b/extensions/default/src/utils/validations/areAllImageSpacingEqual.ts
@@ -24,7 +24,9 @@ export default function areAllImageSpacingEqual(
     return;
   }
   const lastIpp = toNumber(instances[instances.length - 1].ImagePositionPatient);
-
+  if (!lastIpp) {
+    return;
+  }
   const averageSpacingBetweenFrames =
     _getPerpendicularDistance(firstImagePositionPatient, lastIpp) / (instances.length - 1);