diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/managers/SimpleModuleManager.java b/LauncherAPI/src/main/java/pro/gravit/launcher/managers/SimpleModuleManager.java
index 8a929b78..f6ecda38 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/managers/SimpleModuleManager.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/managers/SimpleModuleManager.java
@@ -28,7 +28,13 @@ private ModulesVisitor() {
         public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
             if (file.toFile().getName().endsWith(".jar"))
                 try (JarFile f = new JarFile(file.toFile())) {
-                    loadModule(file.toUri().toURL(), f.getManifest().getMainAttributes().getValue("Main-Class"));
+                    String mainclass = f.getManifest().getMainAttributes().getValue("Main-Class");
+                    if(mainclass == null)
+                    {
+                        LogHelper.error("In module %s Main-Class not found", file.toString());
+                        return super.visitFile(file, attrs);
+                    }
+                    loadModule(file.toUri().toURL(), mainclass);
                 } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
                     LogHelper.error(e);
                 }