From 9301ddd378502520bdecf615ef29d6545422b657 Mon Sep 17 00:00:00 2001
From: Alexander Killing <killing@leifos.de>
Date: Sun, 16 Oct 2022 17:22:07 +0200
Subject: [PATCH] possible fix for #34586: LegacyForm/ilAlphabetInputGUI:
 TypeError thrown with message ilAlphabetInputGUI::fixDBUmlauts(): Argument #1
 () must be of

---
 Services/Form/classes/class.ilAlphabetInputGUI.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Services/Form/classes/class.ilAlphabetInputGUI.php b/Services/Form/classes/class.ilAlphabetInputGUI.php
index 45730037a6f7..7c9c3ce9d787 100644
--- a/Services/Form/classes/class.ilAlphabetInputGUI.php
+++ b/Services/Form/classes/class.ilAlphabetInputGUI.php
@@ -154,6 +154,9 @@ public function getToolbarHTML(): string
 
         $tpl = new ilTemplate("tpl.prop_alphabet.html", true, true, "Services/Form");
         foreach ($this->getLetters() as $l) {
+            if (is_null($l)) {
+                continue;
+            }
             $l = $this->fixDBUmlauts($l);
             $tpl->setCurrentBlock("letter");
             $tpl->setVariable("TXT_LET", $l);