diff --git a/setup/modulediscovery/ModuleFileReader.php b/setup/modulediscovery/ModuleFileReader.php
index 118f2249a..00cb7158e 100644
--- a/setup/modulediscovery/ModuleFileReader.php
+++ b/setup/modulediscovery/ModuleFileReader.php
@@ -175,15 +175,21 @@ class ModuleFileReader
 		}
 
 		$sModuleInstallerClass = $aModuleInfo['installer'];
+		if (strlen($sModuleInstallerClass) === 0) {
+			return null;
+		}
+
 		if (!class_exists($sModuleInstallerClass)) {
 			$sModuleFilePath = $aModuleInfo['module_file_path'];
 			$this->ReadModuleFileInformationUnsafe($sModuleFilePath);
 		}
 
 		if (!class_exists($sModuleInstallerClass)) {
+			\IssueLog::Error(__METHOD__, null, $aModuleInfo);
 			throw new CoreException("Wrong installer class: '$sModuleInstallerClass' is not a PHP class - Module: ".$aModuleInfo['label']);
 		}
 		if (!is_subclass_of($sModuleInstallerClass, 'ModuleInstallerAPI')) {
+			\IssueLog::Error(__METHOD__, null, $aModuleInfo);
 			throw new CoreException("Wrong installer class: '$sModuleInstallerClass' is not derived from 'ModuleInstallerAPI' - Module: ".$aModuleInfo['label']);
 		}
 
diff --git a/setup/runtimeenv.class.inc.php b/setup/runtimeenv.class.inc.php
index 3b857dbd1..d57aaeebc 100644
--- a/setup/runtimeenv.class.inc.php
+++ b/setup/runtimeenv.class.inc.php
@@ -915,7 +915,7 @@ class RunTimeEnvironment
 	 * @param bool $bSampleData Wether or not to load sample data
 	 *  @param null|string[] $aSelectedModules List of selected modules
 	 */
-	public function LoadData($aAvailableModules, $bSampleData, $aSelectedModules=null)
+	public function LoadData($aAvailableModules, $bSampleData, $aSelectedModules = null)
 	{
 		$oDataLoader = new XMLDataLoader();