diff --git a/src/Finder.php b/src/Finder.php
index e753306..646eda8 100644
--- a/src/Finder.php
+++ b/src/Finder.php
@@ -11,7 +11,7 @@
 
 use function current;
 use function end;
-use function is_string;
+use function is_numeric;
 use function iterator_to_array;
 use function key;
 use function prev;
@@ -138,7 +138,7 @@ public static function rows(iterable $data, callable $filter, bool $preserveKey
                 continue;
             }
 
-            if (is_string($key)) {
+            if (! is_numeric($key)) {
                 $rowKey = $key;
             } else {
                 $rowKey = $preserveKey ? $key : $newKey;
diff --git a/tests/FinderTest.php b/tests/FinderTest.php
index 13511ad..a36ab12 100644
--- a/tests/FinderTest.php
+++ b/tests/FinderTest.php
@@ -286,6 +286,12 @@ public static function rowsDataProvider(): array
                 static fn($datum): bool => $datum > 7,
                 ['foo' => 8, 9],
             ],
+            // @see https://3v4l.org/0KWZ7Y
+            [
+                [6, 7, '0' => 8, 9],
+                static fn($datum): bool => $datum > 7,
+                [8, 9],
+            ],
         ];
     }