diff --git a/src/define.rs b/src/define.rs
index 3fa0a34..2095ff4 100644
--- a/src/define.rs
+++ b/src/define.rs
@@ -378,8 +378,7 @@ pub struct FFICALLPARAMS {
   pub errno: Option<bool>,
   pub free_result_memory: bool,
   pub params_type_rs: Rc<Vec<RsArgsValue>>,
-  pub r_type: *mut ffi_type,
-  pub arg_types: Vec<*mut ffi_type>,
+  pub ffi_type_cleanup: FFITypeCleanup,
 }
 pub struct BarePointerWrap(pub *mut c_void);
 unsafe impl Send for FFICALL {}
@@ -429,8 +428,19 @@ pub struct OpenParams {
 pub struct FFITypeCleanup {
   pub struct_type_box: Option<*mut ffi_type>,
   pub elements_box: Option<*mut Vec<*mut ffi_type>>,
+  pub r_type: Option<*mut ffi_type>,
+  pub arg_types: Vec<*mut ffi_type>,
+}
+impl FFITypeCleanup {
+  pub fn new() -> Self {
+    Self {
+      struct_type_box: None,
+      elements_box: None,
+      r_type: None,
+      arg_types: vec![],
+    }
+  }
 }
-
 impl Drop for FFITypeCleanup {
   fn drop(&mut self) {
     unsafe {
diff --git a/src/lib.rs b/src/lib.rs
index b091bc6..b080f79 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -223,10 +223,8 @@ unsafe fn load(env: Env, params: FFIParams) -> napi::Result<JsUnknown> {
   let (mut arg_types, arg_values) = get_arg_types_values(Rc::clone(&params_type_rs), params_value)?;
   let mut arg_values_c_void = get_value_pointer(&env, Rc::clone(&params_type_rs), arg_values)?;
   let ret_type_rs = type_define_to_rs_args(&env, ret_type)?;
-  let mut ffi_type_cleanup = FFITypeCleanup {
-    struct_type_box: None,
-    elements_box: None,
-  };
+  let mut ffi_type_cleanup = FFITypeCleanup::new();
+
   unsafe fn get_ffi_type(
     ret_type_rs: &RsArgsValue,
     ffi_type_cleanup: &mut FFITypeCleanup,
@@ -275,11 +273,12 @@ unsafe fn load(env: Env, params: FFIParams) -> napi::Result<JsUnknown> {
   }
 
   let r_type = get_ffi_type(&ret_type_rs, &mut ffi_type_cleanup);
-
+  ffi_type_cleanup.r_type = Some(r_type);
+  ffi_type_cleanup.arg_types = arg_types;
   let mut cif = ffi_cif {
     abi: ffi_abi_FFI_DEFAULT_ABI,
     nargs: params_type_len as u32,
-    arg_types: arg_types.as_mut_ptr(),
+    arg_types: ffi_type_cleanup.arg_types.as_mut_ptr(),
     rtype: r_type,
     bytes: 0,
     flags: 0,
@@ -302,7 +301,7 @@ unsafe fn load(env: Env, params: FFIParams) -> napi::Result<JsUnknown> {
     ffi_abi_FFI_DEFAULT_ABI,
     params_type_len as u32,
     r_type,
-    arg_types.as_mut_ptr(),
+    ffi_type_cleanup.arg_types.as_mut_ptr(),
   );
   if run_in_new_thread == Some(true) {
     use napi::Task;
@@ -319,7 +318,6 @@ unsafe fn load(env: Env, params: FFIParams) -> napi::Result<JsUnknown> {
         let FFICALLPARAMS {
           arg_values_c_void, ..
         } = &mut self.data;
-
         unsafe {
           let result = libc::malloc(std::mem::size_of::<*mut c_void>());
           ffi_call(
@@ -372,8 +370,7 @@ unsafe fn load(env: Env, params: FFIParams) -> napi::Result<JsUnknown> {
       errno,
       free_result_memory,
       params_type_rs,
-      r_type,
-      arg_types,
+      ffi_type_cleanup,
     });
     let async_work_promise = env.spawn(task)?;
     Ok(async_work_promise.promise_object().into_unknown())
diff --git a/src/utils/dataprocess.rs b/src/utils/dataprocess.rs
index a6bf514..ba80223 100644
--- a/src/utils/dataprocess.rs
+++ b/src/utils/dataprocess.rs
@@ -328,7 +328,7 @@ pub unsafe fn get_value_pointer(
         let c_double = Box::new(val);
         Ok(Box::into_raw(c_double) as *mut c_void)
       }
-      RsArgsValue::U8Array(buffer, v) => {
+      RsArgsValue::U8Array(buffer, _) => {
         let buffer = buffer.unwrap();
         let ptr = buffer.as_ptr();
         std::mem::forget(buffer);
@@ -385,6 +385,7 @@ pub unsafe fn get_value_pointer(
         let func_ret_type = if func_desc.get(RET_TYPE).is_some() {
             func_desc.get(RET_TYPE).unwrap().clone()
         }  else {
+          // void type
             RsArgsValue::I32(7)
         };
         let free_c_params_memory = func_desc.get(FREE_FUNCTION_TAG).unwrap().clone();