From 6e152a71a6c6c5d481998cdce806359cc23f0283 Mon Sep 17 00:00:00 2001
From: PJ Fanning <pjfanning@users.noreply.github.com>
Date: Wed, 17 Dec 2025 21:29:03 +0100
Subject: [PATCH] [bz-69905] check cell before recursing (#978)

---
 .../src/main/java/org/apache/poi/xssf/usermodel/XSSFCell.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFCell.java b/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFCell.java
index d23375fda5..a9062ff7bf 100644
--- a/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFCell.java
+++ b/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFCell.java
@@ -410,7 +410,9 @@ public final class XSSFCell extends CellBase {
             /* In an excel generated array formula, the formula property might be set, but the string is empty in related cells */
             if (f == null || f.getStringValue().isEmpty()) {
                 XSSFCell cell = getSheet().getFirstCellInArrayFormula(this);
-                return cell.getCellFormula(fpb);
+                if (cell != this) {
+                    return cell.getCellFormula(fpb);
+                }
             }
         }
         if (f == null) {