diff --git a/modules/consent/lib/Consent/Store/Cookie.php b/modules/consent/lib/Consent/Store/Cookie.php
index ba59e5c4d9b728d9204caeae554dbb582eecf923..3e80a56e874588052a5aa6d73a6e8d702dd65962 100644
--- a/modules/consent/lib/Consent/Store/Cookie.php
+++ b/modules/consent/lib/Consent/Store/Cookie.php
@@ -264,7 +264,7 @@ class sspmod_consent_Consent_Store_Cookie extends sspmod_consent_Store
     private function _setConsentCookie($name, $value)
     {
         assert('is_string($name)');
-        assert('is_string($value)');
+        assert('is_string($value) || is_null($value)');
 
         $globalConfig = SimpleSAML_Configuration::getInstance();
         $params = array(