From 89213da0252b6dc1ad7729858d803ba579b431af Mon Sep 17 00:00:00 2001
From: lacatoire <la.catoire@gmail.com>
Date: Tue, 10 Feb 2026 17:20:46 +0100
Subject: [PATCH] Fix 500 error when mapping columns to None in network bulk
 upload

When a column was mapped to None (value 0), chr(64 + 0) produced '@'
which is an invalid cell coordinate for PhpSpreadsheet, causing an
uncaught exception. Now fields mapped to None are set to empty string
instead of attempting to read from an invalid cell address.

Fixes #1040
---
 bulk_network.php | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/bulk_network.php b/bulk_network.php
index b6aa9f1b3..939b88341 100644
--- a/bulk_network.php
+++ b/bulk_network.php
@@ -155,8 +155,12 @@
 
       // Load up the $row[] array with the values according to the mapping supplied by the user
       foreach( $fields as $fname ) {
-        $addr = chr( 64 + $_REQUEST[$fname]);
-        $row[$fname] = sanitize($sheet->getCell( $addr . $n )->getValue());
+        if ( $_REQUEST[$fname] == 0 ) {
+          $row[$fname] = "";
+        } else {
+          $addr = chr( 64 + $_REQUEST[$fname]);
+          $row[$fname] = sanitize($sheet->getCell( $addr . $n )->getValue());
+        }
       }
 
       switch( $_REQUEST["KeyField"] ) {