diff --git a/src/Flow/ETL/Rows.php b/src/Flow/ETL/Rows.php
index fcfa917e0..a93c5b00b 100644
--- a/src/Flow/ETL/Rows.php
+++ b/src/Flow/ETL/Rows.php
@@ -319,6 +319,10 @@ public function count() : int
      */
     public function chunks(int $size) : array
     {
+        if ($size < 1) {
+            throw InvalidArgumentException::because('Chunk size must be greater than 0');
+        }
+
         $chunks = [];
 
         foreach (\array_chunk($this->rows, $size) as $chunk) {