From bf331072df0c9c3f3b941a4405c1c9de5f58315c Mon Sep 17 00:00:00 2001
From: Guy Sartorelli <guy.sartorelli@silverstripe.com>
Date: Thu, 11 Aug 2022 15:04:33 +1200
Subject: [PATCH] FIX Don't try to call count() on an iterator

---
 src/ORM/DataList.php | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/ORM/DataList.php b/src/ORM/DataList.php
index 93cf301fb..e68c42dea 100644
--- a/src/ORM/DataList.php
+++ b/src/ORM/DataList.php
@@ -1357,14 +1357,15 @@ class DataList extends ViewableData implements SS_List, Filterable, Sortable, Li
         $currentChunk = 0;
 
         // Keep looping until we run out of chunks
-        while ($chunk = $this->limit($chunkSize, $chunkSize * $currentChunk)->getIterator()) {
+        while ($chunk = $this->limit($chunkSize, $chunkSize * $currentChunk)) {
             // Loop over all the item in our chunk
+            $count = 0;
             foreach ($chunk as $item) {
+                $count++;
                 yield $item;
             }
 
-
-            if ($chunk->count() < $chunkSize) {
+            if ($count < $chunkSize) {
                 // If our last chunk had less item than our chunkSize, we've reach the end.
                 break;
             }