diff --git a/lib/private/Share20/Manager.php b/lib/private/Share20/Manager.php
index 0409327869..f51bf87ee4 100644
--- a/lib/private/Share20/Manager.php
+++ b/lib/private/Share20/Manager.php
@@ -298,13 +298,20 @@ class Manager implements IManager {
 
 		$isFederatedShare = $share->getNode()->getStorage()->instanceOfStorage('\OCA\Files_Sharing\External\Storage');
 		$permissions = 0;
-		$mount = $share->getNode()->getMountPoint();
+
+		$userMounts = $userFolder->getById($share->getNode()->getId());
+		$userMount = array_shift($userMounts);
+		$mount = $userMount->getMountPoint();
 		if (!$isFederatedShare && $share->getNode()->getOwner() && $share->getNode()->getOwner()->getUID() !== $share->getSharedBy()) {
 			// When it's a reshare use the parent share permissions as maximum
 			$userMountPointId = $mount->getStorageRootId();
 			$userMountPoints = $userFolder->getById($userMountPointId);
 			$userMountPoint = array_shift($userMountPoints);
 
+			if ($userMountPoint === null) {
+				throw new GenericShareException('Could not get proper user mount for ' . $userMountPointId . '. Failing since else the next calls are called with null');
+			}
+
 			/* Check if this is an incoming share */
 			$incomingShares = $this->getSharedWith($share->getSharedBy(), Share::SHARE_TYPE_USER, $userMountPoint, -1, 0);
 			$incomingShares = array_merge($incomingShares, $this->getSharedWith($share->getSharedBy(), Share::SHARE_TYPE_GROUP, $userMountPoint, -1, 0));
diff --git a/tests/lib/Share20/ManagerTest.php b/tests/lib/Share20/ManagerTest.php
index e66ac51aee..f2086e388d 100644
--- a/tests/lib/Share20/ManagerTest.php
+++ b/tests/lib/Share20/ManagerTest.php
@@ -613,6 +613,7 @@ class ManagerTest extends \Test\TestCase {
 		$limitedPermssions = $this->createMock(File::class);
 		$limitedPermssions->method('isShareable')->willReturn(true);
 		$limitedPermssions->method('getPermissions')->willReturn(\OCP\Constants::PERMISSION_READ);
+		$limitedPermssions->method('getId')->willReturn(108);
 		$limitedPermssions->method('getPath')->willReturn('path');
 		$limitedPermssions->method('getOwner')
 			->willReturn($owner);
@@ -634,6 +635,7 @@ class ManagerTest extends \Test\TestCase {
 		$nonMoveableMountPermssions = $this->createMock(Folder::class);
 		$nonMoveableMountPermssions->method('isShareable')->willReturn(true);
 		$nonMoveableMountPermssions->method('getPermissions')->willReturn(\OCP\Constants::PERMISSION_READ);
+		$nonMoveableMountPermssions->method('getId')->willReturn(108);
 		$nonMoveableMountPermssions->method('getPath')->willReturn('path');
 		$nonMoveableMountPermssions->method('getOwner')
 			->willReturn($owner);
@@ -655,6 +657,7 @@ class ManagerTest extends \Test\TestCase {
 		$allPermssions = $this->createMock(Folder::class);
 		$allPermssions->method('isShareable')->willReturn(true);
 		$allPermssions->method('getPermissions')->willReturn(\OCP\Constants::PERMISSION_ALL);
+		$allPermssions->method('getId')->willReturn(108);
 		$allPermssions->method('getOwner')
 			->willReturn($owner);
 		$allPermssions->method('getStorage')
@@ -675,6 +678,7 @@ class ManagerTest extends \Test\TestCase {
 		$remoteFile = $this->createMock(Folder::class);
 		$remoteFile->method('isShareable')->willReturn(true);
 		$remoteFile->method('getPermissions')->willReturn(\OCP\Constants::PERMISSION_READ ^ \OCP\Constants::PERMISSION_UPDATE);
+		$remoteFile->method('getId')->willReturn(108);
 		$remoteFile->method('getOwner')
 			->willReturn($owner);
 		$remoteFile->method('getStorage')
@@ -709,6 +713,11 @@ class ManagerTest extends \Test\TestCase {
 		$userFolder->expects($this->any())
 			->method('getId')
 			->willReturn(42);
+		// Id 108 is used in the data to refer to the node of the share.
+		$userFolder->expects($this->any())
+			->method('getById')
+			->with(108)
+			->willReturn([$share->getNode()]);
 		$userFolder->expects($this->any())
 			->method('getRelativePath')
 			->willReturnArgument(0);