From 38ca9f9ad932e71af20fbd862f247b8cd3d62598 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Sat, 13 Oct 2018 11:46:29 +0200
Subject: [PATCH] Fix setting value of multiple selection form field

See #2509
---
 .../form/builder/field/MultipleSelectionFormField.class.php     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/form/builder/field/MultipleSelectionFormField.class.php b/wcfsetup/install/files/lib/system/form/builder/field/MultipleSelectionFormField.class.php
index f30ece0394..3dd841f580 100644
--- a/wcfsetup/install/files/lib/system/form/builder/field/MultipleSelectionFormField.class.php
+++ b/wcfsetup/install/files/lib/system/form/builder/field/MultipleSelectionFormField.class.php
@@ -66,7 +66,7 @@ class MultipleSelectionFormField extends AbstractFormField implements INullableF
 			throw new \InvalidArgumentException("Given value is no array, " . gettype($value) . " given.");
 		}
 		
-		$unknownValues = array_diff($this->getValue(), array_keys($this->getOptions()));
+		$unknownValues = array_diff($value, array_keys($this->getOptions()));
 		if (!empty($unknownValues)) {
 			throw new \InvalidArgumentException("Unknown values '" . implode("', '", $unknownValues) . '"');
 		}
-- 
2.20.1