Handle explicit null for page argument in paginated queries

Author: Kauto

CHANGELOG.md

@@ -9,6 +9,12 @@ You can find and compare releases at the [GitHub release page](https://github.co
 
 ## Unreleased
 
+## v6.64.1
+
+### Fixed
+
+- Handle explicit `null` for `page` argument in paginated queries https://github.com/nuwave/lighthouse/pull/2735
+
 ## v6.64.0
 
 ### Added

src/Pagination/PaginationArgs.php

@@ -36,7 +36,7 @@ public static function extractArgs(array $args, ResolveInfo $resolveInfo, Pagina
                 Cursor::decode($args),
             )
             // Handles cases "paginate" and "simple", which both take the same args.
-            : Arr::get($args, 'page', 1);
+            : Arr::get($args, 'page') ?? 1;
 
         if ($first < 0) {
             throw new Error(self::requestedLessThanZeroItems($first));

tests/Integration/Pagination/PaginateDirectiveDBTest.php

@@ -1010,4 +1010,45 @@ public function testPaginateWithCacheDirective(): void
         }
         ');
     }
+
+    public function testSimplePaginationWithNullPageUsesDefaultPage(): void
+    {
+        factory(User::class, 3)->create();
+
+        $this->schema = /** @lang GraphQL */ '
+        type User {
+            id: ID!
+            name: String!
+        }
+
+        type Query {
+            users: [User!] @paginate(type: SIMPLE)
+        }
+        ';
+
+        $this->graphQL(/** @lang GraphQL */ '
+        query ($page: Int) {
+            users(first: 2, page: $page) {
+                paginatorInfo {
+                    currentPage
+                    count
+                }
+                data {
+                    id
+                }
+            }
+        }
+        ', [
+            'page' => null,
+        ])->assertJson([
+            'data' => [
+                'users' => [
+                    'paginatorInfo' => [
+                        'currentPage' => 1,
+                        'count' => 2,
+                    ],
+                ],
+            ],
+        ])->assertJsonCount(2, 'data.users.data');
+    }
 }