diff --git a/src/main/java/bytecode/ClassCodeGen.java b/src/main/java/bytecode/ClassCodeGen.java
index 59be9ee..7a1c0f0 100644
--- a/src/main/java/bytecode/ClassCodeGen.java
+++ b/src/main/java/bytecode/ClassCodeGen.java
@@ -4,6 +4,7 @@ import ast.ClassNode;
 import ast.member.FieldNode;
 import ast.member.MemberNode;
 import ast.member.MethodNode;
+import ast.type.BaseTypeNode;
 import bytecode.visitor.ClassVisitor;
 import java.io.File;
 import org.objectweb.asm.ClassWriter;
@@ -39,7 +40,9 @@ public class ClassCodeGen implements ClassVisitor {
 
     @Override
     public void visit(FieldNode fieldNode) {
-        classWriter.visitField(mapper.mapAccesTypeToOpcode(fieldNode.accessTypeNode), fieldNode.identifier, mapper.getTypeChar(fieldNode.type.enumTypeNode), null, null );
+        if(fieldNode.type instanceof BaseTypeNode baseTypeNode){
+            classWriter.visitField(mapper.mapAccesTypeToOpcode(fieldNode.accessTypeNode), fieldNode.identifier, mapper.getTypeChar(baseTypeNode.enumType), null, null );
+        }
         classWriter.visitEnd();
     }
 
diff --git a/src/main/java/bytecode/Mapper.java b/src/main/java/bytecode/Mapper.java
index 7f1b219..fb4f484 100644
--- a/src/main/java/bytecode/Mapper.java
+++ b/src/main/java/bytecode/Mapper.java
@@ -1,9 +1,6 @@
 package bytecode;
 
-import ast.type.AccessTypeNode;
-import ast.type.EnumAccessTypeNode;
-import ast.type.EnumTypeNode;
-import ast.type.TypeNode;
+import ast.type.*;
 import org.objectweb.asm.Opcodes;
 
 public class Mapper {
@@ -17,9 +14,9 @@ public class Mapper {
         return 0;
     }
 
-    public String generateMethodDescriptor(TypeNode typeNode) {
+    public String generateMethodDescriptor(BaseTypeNode baseTypeNode) {
         String descriptor = "()";
-        descriptor += getTypeChar(typeNode.enumTypeNode);
+        descriptor += getTypeChar(baseTypeNode.enumType);
         return descriptor;
     }
 
diff --git a/src/main/java/bytecode/MethodCodeGen.java b/src/main/java/bytecode/MethodCodeGen.java
index fd8a29a..e544a8b 100644
--- a/src/main/java/bytecode/MethodCodeGen.java
+++ b/src/main/java/bytecode/MethodCodeGen.java
@@ -2,6 +2,7 @@ package bytecode;
 
 import ast.member.ConstructorNode;
 import ast.member.MethodNode;
+import ast.type.BaseTypeNode;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.MethodVisitor;
 
@@ -27,12 +28,13 @@ public class MethodCodeGen implements bytecode.visitor.MethodVisitor {
 
     @Override
     public void visit(MethodNode methodNode) {
-        MethodVisitor method = classWriter.visitMethod(mapper.mapAccesTypeToOpcode(methodNode.visibility),
-                methodNode.identifier,
-                mapper.generateMethodDescriptor(methodNode.type),
-                null,
-                null);
-
-        method.visitEnd();
+        if(methodNode.type instanceof BaseTypeNode baseTypeNode){
+            MethodVisitor method = classWriter.visitMethod(mapper.mapAccesTypeToOpcode(methodNode.visibility),
+                    methodNode.identifier,
+                    mapper.generateMethodDescriptor(baseTypeNode),
+                    null,
+                    null);
+            method.visitEnd();
+        }
     }
 }