WIP: posting shiai to the wkKalendar via api

homepage/participo/lib/participoLib/participo.php

@@ -55,7 +55,7 @@ class participo
 	/** lazy loading of the session user */
 	public static function sessionUser(bool $forceLoading = true)
 	{
-		if (is_null($sessionUser) || $forceLoading) {
+		if (is_null(self::$sessionUser) || $forceLoading) {
 			self::$sessionUser = User::loadFromDb(self::getSessionUserId());
 		}
 		return self::$sessionUser;