diff --git a/src/callers/register.rs b/src/callers/register.rs
index a17d2bc..a966c01 100644
--- a/src/callers/register.rs
+++ b/src/callers/register.rs
@@ -50,16 +50,37 @@ pub async fn register_user(
         last_login: String::from("nil"),
     };
 
-    match repo::user::insert(&pool, &user).await {
-        Ok(id) => {
-            user.id = id;
-            (
-                StatusCode::CREATED,
-                Json(response::Response {
-                    message: String::from("User inserted"),
-                    data: vec![user],
-                }),
-            )
+    match repo::user::exists(&pool, &user.username).await {
+        Ok(res) => {
+            if res {
+                return (
+                    StatusCode::NOT_FOUND,
+                    Json(response::Response {
+                        message: String::from("Error"),
+                        data: vec![user],
+                    }),
+                );
+            } else {
+                match repo::user::insert(&pool, &user).await {
+                    Ok(id) => {
+                        user.id = id;
+                        (
+                            StatusCode::CREATED,
+                            Json(response::Response {
+                                message: String::from("User inserted"),
+                                data: vec![user],
+                            }),
+                        )
+                    }
+                    Err(err) => (
+                        StatusCode::BAD_REQUEST,
+                        Json(response::Response {
+                            message: err.to_string(),
+                            data: vec![user],
+                        }),
+                    ),
+                }
+            }
         }
         Err(err) => (
             StatusCode::BAD_REQUEST,
diff --git a/src/repo/mod.rs b/src/repo/mod.rs
index 48d6b59..744ced5 100644
--- a/src/repo/mod.rs
+++ b/src/repo/mod.rs
@@ -7,6 +7,26 @@ pub mod user {
         pub date_created: Option<time::OffsetDateTime>,
     }
 
+    pub async fn exists(pool: &sqlx::PgPool, username: &String) -> Result<bool, sqlx::Error> {
+        let result = sqlx::query(
+            r#"
+        SELECT 1 FROM "user" WHERE username = $1
+        "#,
+        )
+        .bind(&username)
+        .fetch_optional(pool)
+        .await;
+
+        match result {
+            Ok(r) => Ok(r.is_some()),
+            Err(e) => {
+                println!("Error: {:?}", e.to_string());
+                // Err(e)
+                Err(e)
+            }
+        }
+    }
+
     pub async fn insert(
         pool: &sqlx::PgPool,
         user: &icarus_models::user::User,