diff --git a/Cargo.lock b/Cargo.lock
index 86fa896..b156014 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2075,9 +2075,7 @@ checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"
 
 [[package]]
 name = "libfj"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f595f6d12b48064b9c14adac6a5f8e85409026fdf1409630a8b8f23dd368f6f3"
+version = "0.9.0"
 dependencies = [
  "async-trait",
  "base64 0.22.1",
diff --git a/Cargo.toml b/Cargo.toml
index bc9e7f9..ad0c16c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,8 +30,8 @@ members = [
 rocket = { version = "0.5.1", features = [ "json" ] }
 actix-web = { version = "4", default-features = false, features = [ "macros", "compress-brotli", "compress-gzip", "compress-zstd"] }
 actix-files = "0.6"
-#libfj = { version = "0.8", path = "../libfj" }
-libfj = { version = "0.8" }
+libfj = { version = "0.9", path = "../libfj" }
+#libfj = { version = "0.8" }
 log = "0.4"
 env_logger = "0.11"
 clap = { version = "4.5", features = [ "derive" ] }
diff --git a/rc_auth/src/robocraft/email.rs b/rc_auth/src/robocraft/email.rs
index 1e3c52d..a7f700f 100644
--- a/rc_auth/src/robocraft/email.rs
+++ b/rc_auth/src/robocraft/email.rs
@@ -3,11 +3,18 @@ use actix_web::{post, web::{Data, Json}};
 
 #[post("/authenticate/email/game")]
 pub async fn email_password_auth(body: Json<libfj::robocraft::EmailUserAuthenticationPayload>, config: Data<super::RcConfig>) -> Result<Json<libfj::robocraft::AuthenticationResponseInfo>, super::ErrorTy> {
-    log::info!("Authenticating {} user {}", body.target, body.display_name);
+    if body.display_name.is_none() {
+        return Err(super::ErrorTy::from_err(oj_rc_core::persist::user::AuthError {
+            message: "Missing display_name".to_owned(),
+            code: oj_rc_core::data::error_codes::AuthErrorCode::BadCredentials,
+        }));
+    }
+    let display_name = body.display_name.clone().unwrap();
+    log::info!("Authenticating {} email user {}", body.target, display_name);
     let payload = libfj::robocraft::TokenPayload {
-        public_id: body.display_name.clone(),
-        display_name: body.display_name.clone(),
-        robocraft_name: body.display_name.clone(),
+        public_id: display_name.clone(),
+        display_name: display_name.clone(),
+        robocraft_name: display_name.clone(),
         email_address: body.email_address.clone(),
         email_verified: true,
         flags: Vec::new(),
@@ -18,7 +25,7 @@ pub async fn email_password_auth(body: Json<libfj::robocraft::EmailUserAuthentic
     };
     let response = config.account_provider.login(user_info).await
         .map_err(|e| {
-            log::error!("Failed to authenticate {} user {}: {}", body.target, body.display_name, e.message);
+            log::error!("Failed to authenticate {} user {}: {}", body.target, display_name, e.message);
             super::ErrorTy::from_err(e)
         })?;
     Ok(Json(response.response))
diff --git a/rc_auth/src/robocraft/mod.rs b/rc_auth/src/robocraft/mod.rs
index 1ae78cb..75a5316 100644
--- a/rc_auth/src/robocraft/mod.rs
+++ b/rc_auth/src/robocraft/mod.rs
@@ -21,7 +21,7 @@ impl RcConfig {
     }
 }
 
- struct ErrorTy {
+struct ErrorTy {
     json: libfj::robocraft::ErrorInfo,
 }
 
diff --git a/rc_auth/src/robocraft/username.rs b/rc_auth/src/robocraft/username.rs
index 694d213..1928df8 100644
--- a/rc_auth/src/robocraft/username.rs
+++ b/rc_auth/src/robocraft/username.rs
@@ -3,11 +3,18 @@ use actix_web::{post, web::{Data, Json}};
 
 #[post("/authenticate/robocraft/game")]
 pub async fn user_password_auth(body: Json<libfj::robocraft::EmailUserAuthenticationPayload>, config: Data<super::RcConfig>) -> Result<Json<libfj::robocraft::AuthenticationResponseInfo>, super::ErrorTy> {
-    log::info!("Authenticating {} user {}", body.target, body.display_name);
+    if body.display_name.is_none() {
+        return Err(super::ErrorTy::from_err(oj_rc_core::persist::user::AuthError {
+            message: "Missing display_name".to_owned(),
+            code: oj_rc_core::data::error_codes::AuthErrorCode::BadCredentials,
+        }));
+    }
+    let display_name = body.display_name.clone().unwrap();
+    log::info!("Authenticating {} user {}", body.target, display_name);
     let payload = libfj::robocraft::TokenPayload {
-        public_id: body.display_name.clone(),
-        display_name: body.display_name.clone(),
-        robocraft_name: body.display_name.clone(),
+        public_id: display_name.clone(),
+        display_name: display_name.clone(),
+        robocraft_name: display_name.clone(),
         email_address: body.email_address.clone(),
         email_verified: true,
         flags: Vec::new(),
@@ -18,7 +25,7 @@ pub async fn user_password_auth(body: Json<libfj::robocraft::EmailUserAuthentica
     };
     let response = config.account_provider.login(user_info).await
         .map_err(|e| {
-            log::error!("Failed to authenticate {} user {}: {}", body.target, body.display_name, e.message);
+            log::error!("Failed to authenticate {} user {}: {}", body.target, display_name, e.message);
             super::ErrorTy::from_err(e)
         })?;
     Ok(Json(response.response))