Fix undefined array key 0 in RW::parseError() when results is empty

src/AbraFlexi/RW.php

@@ -166,7 +166,7 @@ public function parseError(array $responseDecoded)
             $this->errors = $responseDecoded['errors'];
         }
 
-        if (\array_key_exists('results', $responseDecoded) && \is_array($responseDecoded['results'])) {
+        if (\array_key_exists('results', $responseDecoded) && \is_array($responseDecoded['results']) && \count($responseDecoded['results']) > 0) {
             if (\array_key_exists(0, $responseDecoded['results'])) {
                 foreach ($responseDecoded['results'] as $result) {
                     if (\array_key_exists('request-id', $result)) {

tests/src/AbraFlexi/ParseErrorEmptyResultsTest.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\AbraFlexi;
+
+use AbraFlexi\RW;
+
+/**
+ * Test for issue #98: parseError() crashes when results is an empty array.
+ */
+class ParseErrorEmptyResultsTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers \AbraFlexi\RW::parseError
+     */
+    public function testParseErrorWithEmptyResultsArray(): void
+    {
+        $rw = new RW(null, ['offline' => true]);
+
+        // Simulate the API response that causes the crash:
+        // success is true but results is an empty array
+        $responseDecoded = [
+            'success' => 'true',
+            'stats' => [
+                'created' => '0',
+                'updated' => '0',
+                'deleted' => '0',
+                'skipped' => '0',
+                'failed' => '0',
+            ],
+            'results' => [],
+        ];
+
+        // This should not throw "Undefined array key 0"
+        $errorCount = $rw->parseError($responseDecoded);
+
+        $this->assertSame(0, $errorCount);
+    }
+
+    /**
+     * @covers \AbraFlexi\RW::parseError
+     */
+    public function testParseErrorWithNonEmptyResultsStillWorks(): void
+    {
+        $rw = new RW(null, ['offline' => true]);
+
+        $responseDecoded = [
+            'results' => [
+                [
+                    'errors' => [
+                        ['message' => 'Some error', 'for' => 'field'],
+                    ],
+                ],
+            ],
+        ];
+
+        $errorCount = $rw->parseError($responseDecoded);
+
+        $this->assertGreaterThan(0, $errorCount);
+    }
+}