diff --git a/lib/Horde/Core/ActiveSync/Driver.php b/lib/Horde/Core/ActiveSync/Driver.php
index ec477b68..86b1ccaf 100644
--- a/lib/Horde/Core/ActiveSync/Driver.php
+++ b/lib/Horde/Core/ActiveSync/Driver.php
@@ -1422,11 +1422,15 @@ public function getServerChanges(
             $flags = $folder->flags();
             $categories = $folder->categories();
             foreach ($changes['modify'] as $uid) {
+                if (!isset($flags[$uid])) {
+                    continue;
+                }
+
                 $results[] = [
                     'id' => $uid,
                     'type' => Horde_ActiveSync::CHANGE_TYPE_FLAGS,
                     'flags' => $flags[$uid],
-                    'categories' => $categories[$uid],
+                    'categories' => $categories[$uid] ?? [],
                 ];
             }
         } else {
diff --git a/lib/Horde/Core/Prefs/Ui.php b/lib/Horde/Core/Prefs/Ui.php
index b851ff6c..7b5268cd 100644
--- a/lib/Horde/Core/Prefs/Ui.php
+++ b/lib/Horde/Core/Prefs/Ui.php
@@ -768,9 +768,10 @@ protected function _loadPrefs($app, $data = false)
 
         try {
             $pconf = $registry->loadConfigFile('prefs.php', ['prefGroups', '_prefs'], $app);
+            $config = $pconf->config ?? [];
             $res = [
-                'prefGroups' => $pconf->config['prefGroups'],
-                '_prefs' => $pconf->config['_prefs'],
+                'prefGroups' => $config['prefGroups'] ?? [],
+                '_prefs' => $config['_prefs'] ?? [],
             ];
         } catch (Horde_Exception $e) {
             $res = [
diff --git a/src/Factory/LogHandlerFactory.php b/src/Factory/LogHandlerFactory.php
index 0a142df3..55f2f983 100644
--- a/src/Factory/LogHandlerFactory.php
+++ b/src/Factory/LogHandlerFactory.php
@@ -76,9 +76,8 @@ public function create(Injector $injector): LogHandler
 
                     case 'default':
                     default:
-                        // Match legacy Horde_Log_Handler_Stream + SimpleFormatter:
-                        // append a line break after the (pre-formatted) message.
-                        $formatters[] = new SimpleFormatter('%message%' . PHP_EOL);
+                        // Match legacy Horde_Log_Handler_Stream + SimpleFormatter.
+                        $formatters[] = new SimpleFormatter();
                         break;
 
                     case 'xml':