diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index ad18203e4..40c20d019 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -314,7 +314,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        path: [86, 249, 262]
+        path: [86, 249, 262, 319]
     steps:
       - uses: actions/checkout@v2
 
diff --git a/Cargo.toml b/Cargo.toml
index 2345844cd..46d972dd7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -63,7 +63,7 @@ default = [
 ]
 macros = ["sea-orm-macros"]
 mock = []
-with-json = ["serde_json", "sea-query/with-json"]
+with-json = ["serde_json", "sea-query/with-json", "chrono/serde"]
 with-chrono = ["chrono", "sea-query/with-chrono"]
 with-rust_decimal = ["rust_decimal", "sea-query/with-rust_decimal"]
 with-uuid = ["uuid", "sea-query/with-uuid"]
diff --git a/issues/319/Cargo.toml b/issues/319/Cargo.toml
new file mode 100644
index 000000000..3eb4adaa3
--- /dev/null
+++ b/issues/319/Cargo.toml
@@ -0,0 +1,18 @@
+[workspace]
+# A separate workspace
+
+[package]
+name = "sea-orm-issues-319"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+async-std = { version = "^1", features = ["attributes"] }
+serde = { version = "^1", features = ["derive"] }
+sea-orm = { path = "../../", features = [
+    "sqlx-mysql",
+    "runtime-async-std-native-tls",
+    "with-json",
+    "macros",
+], default-features = false }
diff --git a/issues/319/src/main.rs b/issues/319/src/main.rs
new file mode 100644
index 000000000..1710c37cf
--- /dev/null
+++ b/issues/319/src/main.rs
@@ -0,0 +1,14 @@
+mod material;
+use sea_orm::*;
+
+#[async_std::main]
+pub async fn main() {
+    let db = Database::connect("mysql://sea:sea@localhost/bakery")
+        .await
+        .unwrap();
+
+    async_std::task::spawn(async move {
+        material::Entity::find().one(&db).await.unwrap();
+    })
+    .await;
+}
diff --git a/issues/319/src/material.rs b/issues/319/src/material.rs
new file mode 100644
index 000000000..9586189d4
--- /dev/null
+++ b/issues/319/src/material.rs
@@ -0,0 +1,20 @@
+use sea_orm::entity::prelude::*;
+use serde::{Serialize, Deserialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "materials")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: i32,
+    pub created_at: DateTimeWithTimeZone,
+    pub updated_at: DateTimeWithTimeZone,
+    pub name: String,
+    #[sea_orm(column_type = "Text", nullable)]
+    pub description: Option<String>,
+    pub tag_ids: Vec<u8>,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}