diff --git a/Launcher/src/main/java/pro/gravit/launcher/LauncherAgent.java b/Launcher/src/main/java/pro/gravit/launcher/LauncherAgent.java
index 317bd48a..a86ac483 100644
--- a/Launcher/src/main/java/pro/gravit/launcher/LauncherAgent.java
+++ b/Launcher/src/main/java/pro/gravit/launcher/LauncherAgent.java
@@ -6,6 +6,8 @@
 import java.nio.file.Path;
 import java.util.jar.JarFile;
 
+import pro.gravit.launcher.patches.FMLPatcher;
+import pro.gravit.launcher.utils.NativeJVMHalt;
 import pro.gravit.utils.helper.LogHelper;
 
 @LauncherAPI
@@ -31,10 +33,8 @@ public static void premain(String agentArgument, Instrumentation instrumentation
         System.out.println("Launcher Agent");
         checkAgentStacktrace();
         inst = instrumentation;
-        //SafeExitJVMLegacy.class.getName();
-        //SafeExitJVM.class.getName();
-        //NativeJVMHalt.class.getName();
-        //NativeJVMHalt.initFunc();
+        NativeJVMHalt.initFunc();
+        FMLPatcher.apply();
         isAgentStarted = true;
     }
     public static void checkAgentStacktrace()
diff --git a/Launcher/src/main/java/pro/gravit/launcher/patches/FMLPatcher.java b/Launcher/src/main/java/pro/gravit/launcher/patches/FMLPatcher.java
new file mode 100644
index 00000000..3b1a7b77
--- /dev/null
+++ b/Launcher/src/main/java/pro/gravit/launcher/patches/FMLPatcher.java
@@ -0,0 +1,41 @@
+package pro.gravit.launcher.patches;
+
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
+
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.InsnNode;
+import org.objectweb.asm.tree.MethodNode;
+
+import pro.gravit.launcher.LauncherAgent;
+
+public class FMLPatcher implements ClassFileTransformer {
+	@Override
+	public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
+			ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
+		try {
+			if (className.startsWith("java") || className.startsWith("sun") || className.startsWith("com/sun") || className.startsWith("javafx")) return classfileBuffer;
+			ClassReader cr = new ClassReader(classfileBuffer);
+			if ("java/lang/SecurityManager".equals(cr.getSuperName()) && (className.contains("cpw") || className.contains("mods") || className.contains("forge"))) {
+				ClassNode cn = new ClassNode();
+				cr.accept(cn, ClassReader.EXPAND_FRAMES);
+				for (MethodNode m : cn.methods)
+					if (m.name.equals("checkPermission") && m.desc.equals("(Ljava/lang/String;)V")) {
+						m.instructions.clear();
+						m.instructions.insert(new InsnNode(Opcodes.RETURN));
+					}
+				ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
+				cn.accept(cw);
+				return cw.toByteArray();
+			}
+		} catch (Throwable e) { }
+		return classfileBuffer;
+	}
+	public static void apply() {
+		LauncherAgent.inst.addTransformer(new FMLPatcher());
+	}
+}
diff --git a/Launcher/src/main/java/pro/gravit/launcher/utils/NativeJVMHalt.java b/Launcher/src/main/java/pro/gravit/launcher/utils/NativeJVMHalt.java
index 14fa7a04..e7048c1a 100644
--- a/Launcher/src/main/java/pro/gravit/launcher/utils/NativeJVMHalt.java
+++ b/Launcher/src/main/java/pro/gravit/launcher/utils/NativeJVMHalt.java
@@ -2,6 +2,7 @@
 
 import cpw.mods.fml.SafeExitJVMLegacy;
 import net.minecraftforge.fml.SafeExitJVM;
+import pro.gravit.utils.helper.JVMHelper;
 
 public final class NativeJVMHalt {
     public NativeJVMHalt(int haltCode) {
@@ -21,11 +22,7 @@ private boolean aaabBooleanC_D() {
     public static void haltA(int code) {
         NativeJVMHalt halt = new NativeJVMHalt(code);
         try {
-            SafeExitJVMLegacy.exit(code);
-        } catch (Throwable ignored) {
-        }
-        try {
-            SafeExitJVM.exit(code);
+        	JVMHelper.RUNTIME.exit(code);
         } catch (Throwable ignored) {
         }
         halt.aaabbb38C_D();
diff --git a/LauncherAuthlib/src/main/java/cpw/mods/fml/SafeExitJVMLegacy.java b/LauncherAuthlib/src/main/java/cpw/mods/fml/SafeExitJVMLegacy.java
deleted file mode 100644
index 76673b94..00000000
--- a/LauncherAuthlib/src/main/java/cpw/mods/fml/SafeExitJVMLegacy.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package cpw.mods.fml;
-
-import pro.gravit.utils.helper.JVMHelper;
-
-// FMLSecurityManager запрещает делать System.exit из классов
-// Не входящих в пакеты самого Forge
-public class SafeExitJVMLegacy {
-    public static void exit(int code) {
-    	JVMHelper.RUNTIME.halt(code);
-    }
-}
diff --git a/LauncherAuthlib/src/main/java/net/minecraftforge/fml/SafeExitJVM.java b/LauncherAuthlib/src/main/java/net/minecraftforge/fml/SafeExitJVM.java
deleted file mode 100644
index 448ff164..00000000
--- a/LauncherAuthlib/src/main/java/net/minecraftforge/fml/SafeExitJVM.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package net.minecraftforge.fml;
-
-import pro.gravit.utils.helper.JVMHelper;
-
-// FMLSecurityManager запрещает делать System.exit из классов
-// Не входящих в пакеты самого Forge
-public class SafeExitJVM {
-    public static void exit(int code) {
-        JVMHelper.RUNTIME.halt(code);
-    }
-}