diff --git a/apps/files_sharing/lib/Controller/ShareesAPIController.php b/apps/files_sharing/lib/Controller/ShareesAPIController.php
index d556ab76f6..61678e67c1 100644
--- a/apps/files_sharing/lib/Controller/ShareesAPIController.php
+++ b/apps/files_sharing/lib/Controller/ShareesAPIController.php
@@ -198,13 +198,12 @@ class ShareesAPIController extends OCSController {
 			$shareTypes[] = Share::SHARE_TYPE_CIRCLE;
 		}
 
-		if (isset($_GET['shareType']) && is_array($_GET['shareType'])) {
-			$shareTypes = array_intersect($shareTypes, $_GET['shareType']);
-			sort($shareTypes);
+		if ($shareType !== null && is_array($shareType)) {
+			$shareTypes = array_intersect($shareTypes, $shareType);
 		} else if (is_numeric($shareType)) {
 			$shareTypes = array_intersect($shareTypes, [(int) $shareType]);
-			sort($shareTypes);
 		}
+		sort($shareTypes);
 
 		$this->shareWithGroupOnly = $this->config->getAppValue('core', 'shareapi_only_share_with_group_members', 'no') === 'yes';
 		$this->shareeEnumeration = $this->config->getAppValue('core', 'shareapi_allow_share_dialog_user_enumeration', 'yes') === 'yes';
diff --git a/apps/files_sharing/tests/Controller/ShareesAPIControllerTest.php b/apps/files_sharing/tests/Controller/ShareesAPIControllerTest.php
index 8c0c5b1e41..1fb14ad9b8 100644
--- a/apps/files_sharing/tests/Controller/ShareesAPIControllerTest.php
+++ b/apps/files_sharing/tests/Controller/ShareesAPIControllerTest.php
@@ -271,9 +271,12 @@ class ShareesAPIControllerTest extends TestCase {
 			->setMethods(['isRemoteSharingAllowed', 'shareProviderExists', 'isRemoteGroupSharingAllowed'])
 			->getMock();
 
+		$expectedShareTypes = $shareTypes;
+		sort($expectedShareTypes);
+
 		$this->collaboratorSearch->expects($this->once())
 			->method('search')
-			->with($search, $shareTypes, $this->anything(), $perPage, $perPage * ($page -1))
+			->with($search, $expectedShareTypes, $this->anything(), $perPage, $perPage * ($page -1))
 			->willReturn([[], false]);
 
 		$sharees->expects($this->any())
@@ -398,7 +401,7 @@ class ShareesAPIControllerTest extends TestCase {
 		$this->assertSame($expected, $this->invokePrivate($this->sharees, 'isRemoteSharingAllowed', [$itemType]));
 	}
 
-	
+
 	public function testSearchNoItemType() {
 		$this->expectException(\OCP\AppFramework\OCS\OCSBadRequestException::class);
 		$this->expectExceptionMessage('Missing itemType');