diff --git a/src/c_lib.rs b/src/c_lib.rs
index a5037fa..19128df 100644
--- a/src/c_lib.rs
+++ b/src/c_lib.rs
@@ -803,13 +803,12 @@ pub extern "C" fn execute_vade(
                     request_function_callback,
                 )
                 .map_err(stringify_generic_error)?;
-                vade_evan
+                Ok(vade_evan
                     .helper_convert_credential_to_nquads(
                         arguments_vec.get(0).unwrap_or_else(|| &no_args),
                     )
                     .await
-                    .map_err(stringify_vade_evan_error)?;
-                Ok("".to_string())
+                    .map_err(stringify_vade_evan_error)?)
             }
         }),
         #[cfg(any(feature = "vc-zkp-bbs"))]
diff --git a/src/main.rs b/src/main.rs
index 1ccc80a..192a4a0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -261,8 +261,7 @@ async fn main() -> Result<()> {
                         "credential",
                         None,
                     ))
-                    .await?;
-                "".to_string()
+                    .await?
             }
             #[cfg(all(feature = "vc-zkp-bbs", feature = "did-sidetree"))]
             ("create_self_issued_credential", Some(sub_m)) => {
diff --git a/src/wasm_lib.rs b/src/wasm_lib.rs
index f84dfe0..1e573d6 100644
--- a/src/wasm_lib.rs
+++ b/src/wasm_lib.rs
@@ -452,12 +452,11 @@ cfg_if::cfg_if! {
             credential: String,
         ) -> Result<String, JsValue> {
             let mut vade_evan = get_vade_evan(None).map_err(jsify_generic_error)?;
-            vade_evan
+            Ok(vade_evan
                 .helper_convert_credential_to_nquads(
                     &credential,
                 ).await
-                .map_err(jsify_vade_evan_error)?;
-            Ok("".to_string())
+                .map_err(jsify_vade_evan_error)?)
         }
 
         #[cfg(all(feature = "vc-zkp-bbs", feature = "did-sidetree"))]