From fc932a9a8f40cb696a6af6a098a79209a6e7aa8d Mon Sep 17 00:00:00 2001
From: Kamil Tekiela <tekiela246@gmail.com>
Date: Mon, 15 Aug 2022 14:19:17 +0100
Subject: [PATCH] Allow fields to be set to NULL

Signed-off-by: Kamil Tekiela <tekiela246@gmail.com>
---
 libraries/classes/InsertEdit.php |  1 +
 test/classes/InsertEditTest.php  | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/libraries/classes/InsertEdit.php b/libraries/classes/InsertEdit.php
index 33b692777d..3301c529c5 100644
--- a/libraries/classes/InsertEdit.php
+++ b/libraries/classes/InsertEdit.php
@@ -1673,6 +1673,7 @@ class InsertEdit
                 . ' = ' . $currentValueAsAnArray;
         } elseif (
             ! (empty($multiEditFuncs[$key])
+                && empty($multiEditColumnsNull[$key])
                 && isset($multiEditColumnsPrev[$key])
                 && $currentValue === $multiEditColumnsPrev[$key])
             && $currentValueAsAnArray !== ''
diff --git a/test/classes/InsertEditTest.php b/test/classes/InsertEditTest.php
index 13ee204b74..590fa810d3 100644
--- a/test/classes/InsertEditTest.php
+++ b/test/classes/InsertEditTest.php
@@ -2143,6 +2143,30 @@ class InsertEditTest extends AbstractTestCase
             ],
             $result
         );
+
+        // Test to see if a field can be set to NULL
+        $result = $this->insertEdit->getQueryValuesForInsertAndUpdateInMultipleEdit(
+            $multi_edit_columns_name,
+            ['on'],
+            '',
+            [''],
+            [],
+            false,
+            [],
+            [],
+            'NULL',
+            [],
+            '0',
+            []
+        );
+
+        $this->assertEquals(
+            [
+                ['`fld` = NULL'],
+                [],
+            ],
+            $result
+        );
     }
 
     /**