diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index 19b0a7bb..25263b50 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -259,7 +259,7 @@ class ConfigurationManager
     }
 
     public bool $collaboraSeccompDisabled {
-        get => booleanize($this->GetEnvironmentalVariableOrConfig('COLLABORA_SECCOMP_DISABLED', 'collabora_seccomp_disabled', ''));
+        get => $this->booleanize($this->GetEnvironmentalVariableOrConfig('COLLABORA_SECCOMP_DISABLED', 'collabora_seccomp_disabled', ''));
         set { $this->set('collabora_seccomp_disabled', $value); }
     }
 
@@ -269,22 +269,22 @@ class ConfigurationManager
     }
 
     public bool $disableBackupSection {
-        get => booleanize($this->GetEnvironmentalVariableOrConfig('AIO_DISABLE_BACKUP_SECTION', 'disable_backup_section', ''));
+        get => $this->booleanize($this->GetEnvironmentalVariableOrConfig('AIO_DISABLE_BACKUP_SECTION', 'disable_backup_section', ''));
         set { $this->set('disable_backup_section', $value); }
     }
 
     public bool $nextcloudEnableDriDevice{
-        get => booleanize($this->GetEnvironmentalVariableOrConfig('NEXTCLOUD_ENABLE_DRI_DEVICE', 'nextcloud_enable_dri_device', ''));
+        get => $this->booleanize($this->GetEnvironmentalVariableOrConfig('NEXTCLOUD_ENABLE_DRI_DEVICE', 'nextcloud_enable_dri_device', ''));
         set { $this->set('nextcloud_enable_dri_device', $value); }
     }
 
     public bool $enableNvidiaGpu {
-        get => booleanize($this->GetEnvironmentalVariableOrConfig('NEXTCLOUD_ENABLE_NVIDIA_GPU', 'enable_nvidia_gpu', ''));
+        get => $this->booleanize($this->GetEnvironmentalVariableOrConfig('NEXTCLOUD_ENABLE_NVIDIA_GPU', 'enable_nvidia_gpu', ''));
         set { $this->set('enable_nvidia_gpu', $value); }
     }
 
     public bool $nextcloudKeepDisabledApps {
-        get => booleanize($this->GetEnvironmentalVariableOrConfig('NEXTCLOUD_KEEP_DISABLED_APPS', 'nextcloud_keep_disabled_apps', ''));
+        get => $this->booleanize($this->GetEnvironmentalVariableOrConfig('NEXTCLOUD_KEEP_DISABLED_APPS', 'nextcloud_keep_disabled_apps', ''));
         set { $this->set('nextcloud_keep_disabled_apps', $value); }
     }
 
@@ -934,6 +934,12 @@ class ConfigurationManager
     }
 
     private function camelize(string $input, string $delimiter = '_') : string {
+        if ($input === '') {
+            throw new InvalidSettingConfigurationException('input cannot be empty!');
+        }
+        if ($delimiter === '') {
+            $delimiter = '_';
+        }
         return lcfirst(implode("", array_map('ucfirst', explode($delimiter, strtolower($input)))));
 
     }
@@ -948,17 +954,17 @@ class ConfigurationManager
                 error_log("Invalid input: '$variable' is not a string or does not contain an equal sign ('=')");
                 continue;
             }
-            $keyWithValue = $confManager->replaceEnvPlaceholders($variable);
+            $keyWithValue = $this->replaceEnvPlaceholders($variable);
             // Pad the result with nulls so psalm is happy (and we don't risk to run into warnings in case
             // the check for an equal sign from above gets changed).
             [$key, $value] = explode('=', $keyWithValue, 2) + [null, null];
             $key = $this->camelize($key);
             if ($value === null) {
                 error_log("Invalid input: '$keyWithValue' has no value after the equal sign");
-            } else if (!property_exists($confManager, $key)) {
+            } else if (!property_exists($this, $key)) {
                 error_log("Error: '$key' is not a valid configuration key (in '$keyWithValue')");
             } else {
-                $confManager->$key = $value;
+                $this->$key = $value;
             }
         }
         $this->commitTransaction();
@@ -1030,7 +1036,7 @@ class ConfigurationManager
             'NEXTCLOUD_STARTUP_APPS' => $this->GetNextcloudStartupApps(),
             'NEXTCLOUD_ADDITIONAL_APKS' => $this->nextcloudAdditionalApks,
             'NEXTCLOUD_ADDITIONAL_PHP_EXTENSIONS' => $this->nextcloudAdditionalPhpExtensions,
-            'INSTALL_LATEST_MAJOR' => $this->installLatestMajor,
+            'INSTALL_LATEST_MAJOR' => $this->installLatestMajor ? 'yes' : '',
             'REMOVE_DISABLED_APPS' => $this->nextcloudKeepDisabledApps ? '' : 'yes',
             // Allow to get local ip-address of database container which allows to talk to it even in host mode (the container that requires this needs to be started first then)
             'AIO_DATABASE_HOST' => gethostbyname('nextcloud-aio-database'),