diff --git a/src/Finder.php b/src/Finder.php
index 74a1041..b07c5e1 100644
--- a/src/Finder.php
+++ b/src/Finder.php
@@ -36,14 +36,14 @@ public static function last(iterable $data, callable $filter): mixed
      */
     private static function locateFirst(iterable $data, callable $filter, bool $isReverse = false): mixed
     {
-        // convert to array if $data is Traversable
-        if ($data instanceof Traversable) {
-            $data = iterator_to_array($data);
-        }
+        if ($isReverse) {
+            // convert to array if $data is Traversable
+            if ($data instanceof Traversable) {
+                $data = iterator_to_array($data);
+            }
 
-        Assert::isArray($data);
+            Assert::isArray($data);
 
-        if ($isReverse) {
             /** @var mixed[] $data */
             $data = array_reverse($data);
         }