diff --git a/src/model.rs b/src/model.rs
index 5e0ce15..2256796 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -61,7 +61,7 @@ impl InstrumentSession {
                 ],
             )
             .await?;
-        Ok(root.data.into_iter().map(|d| Run { data: d }).collect())
+        Ok(root.into_data().map(|d| Run { data: d }).collect())
     }
 }
 
@@ -161,7 +161,7 @@ struct Run {
 #[Object]
 impl Run {
     async fn scan_number(&self) -> Option<i64> {
-        if let NodeAttributes::Container(attr) = &self.data.attributes {
+        if let NodeAttributes::Container(attr) = &*self.data.attributes {
             attr.metadata.start_doc().map(|sd| sd.scan_id)
         } else {
             None
@@ -182,7 +182,7 @@ impl Run {
             )
             .await?;
         let mut sources = Vec::new();
-        for stream in run_data.data {
+        for stream in run_data.data() {
             let stream_data = client
                 .search(
                     &format!("{}/{}", self.data.id, stream.id),
@@ -190,8 +190,8 @@ impl Run {
                     &[("include_data_sources", "true".into())],
                 )
                 .await?;
-            for dataset in stream_data.data {
-                match dataset.attributes {
+            for dataset in stream_data.into_data() {
+                match *dataset.attributes {
                     NodeAttributes::Array(attrs) => sources.push(RunData::Array(ArrayData {
                         run: self,
                         stream: stream.id.clone(),
diff --git a/src/model/node.rs b/src/model/node.rs
index 3d493f2..0b5be61 100644
--- a/src/model/node.rs
+++ b/src/model/node.rs
@@ -6,19 +6,50 @@ use serde_json::Value;
 
 use crate::model::{array, container, table};
 
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
 pub struct Root {
-    pub data: Vec<Data>,
+    data: Vec<DataOption>,
     pub error: Value,
     pub links: Option<Links>,
     pub meta: Value,
 }
 
+impl Root {
+    pub fn data(&self) -> impl Iterator<Item = &Data> {
+        self.data.iter().flat_map(DataOption::as_data)
+    }
+    pub fn into_data(self) -> impl Iterator<Item = Data> {
+        self.data.into_iter().flat_map(DataOption::into_data)
+    }
+}
+
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum DataOption {
+    Data(Data),
+    Error(Value),
+}
+
+impl DataOption {
+    pub fn as_data(&self) -> Option<&Data> {
+        match self {
+            Self::Data(data) => Some(data),
+            Self::Error(_) => None,
+        }
+    }
+    pub fn into_data(self) -> Option<Data> {
+        match self {
+            Self::Data(data) => Some(data),
+            Self::Error(_) => None,
+        }
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct Data {
     pub id: String,
-    pub attributes: NodeAttributes,
-    pub links: Links,
+    pub attributes: Box<NodeAttributes>,
+    pub links: Box<Links>,
     pub meta: Value,
 }