diff --git a/sdk/core/src/data/vm.rs b/sdk/core/src/data/vm.rs
index 4b6e15539d..f1af94b10a 100644
--- a/sdk/core/src/data/vm.rs
+++ b/sdk/core/src/data/vm.rs
@@ -85,6 +85,7 @@ pub struct StorageUpdateApi {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct VMOutputApi {
+    #[serde(default)]
     pub return_data: Vec<String>,
     pub return_code: String,
     pub return_message: String,