diff --git a/apps/api/src/services/nginx/info/upstream.rs b/apps/api/src/services/nginx/info/upstream.rs
index 4c38b61..b7cb0af 100644
--- a/apps/api/src/services/nginx/info/upstream.rs
+++ b/apps/api/src/services/nginx/info/upstream.rs
@@ -6,6 +6,7 @@ use tracing::warn;
 use uuid::Uuid;
 
 use crate::{
+    errors::service_error::ServiceError,
     services::nginx::{
         builder::{INDENT_SIZE, NginxConfigProvider},
         info::upstream_target as upstream_target_info,
@@ -51,12 +52,12 @@ pub struct UpdateUpstreamInfo {
 }
 
 impl NginxConfigProvider for UpstreamInfo {
-    fn to_nginx_config(&self, indent: Option<usize>) -> String {
+    fn to_nginx_config(&self, indent: Option<usize>) -> Result<String, ServiceError> {
         let targets_config: Vec<String> = self
             .upstream_targets
             .iter()
             .map(|target| target.to_nginx_config(Some(indent.unwrap_or(0) + INDENT_SIZE)))
-            .collect();
+            .collect::<Result<Vec<String>, ServiceError>>()?;
 
         let mut targets_config_str = {
             let config_str = match self.algorithm.as_str() {
@@ -104,7 +105,10 @@ impl NginxConfigProvider for UpstreamInfo {
                 .push_str(&PLACEHOLDER_TARGET.indent(indent.unwrap_or(0) + INDENT_SIZE));
         }
 
-        format!("upstream {} {{\n{}\n}}", self.name, targets_config_str).indent(indent.unwrap_or(0))
+        Ok(
+            format!("upstream {} {{\n{}\n}}", self.name, targets_config_str)
+                .indent(indent.unwrap_or(0)),
+        )
     }
 }
 
diff --git a/apps/api/src/services/nginx/info/upstream_target.rs b/apps/api/src/services/nginx/info/upstream_target.rs
index b558566..acee880 100644
--- a/apps/api/src/services/nginx/info/upstream_target.rs
+++ b/apps/api/src/services/nginx/info/upstream_target.rs
@@ -6,6 +6,7 @@ use uuid::Uuid;
 use database::generated::entities::{upstream, upstream_target};
 
 use crate::{
+    errors::service_error::ServiceError,
     services::nginx::{builder::NginxConfigProvider, traits::indentable::Indentable},
     set_if_some,
 };
@@ -128,8 +129,8 @@ impl From<UpstreamTargetCreateInfo> for upstream_target::ActiveModel {
 }
 
 impl NginxConfigProvider for UpstreamTargetInfo {
-    fn to_nginx_config(&self, indent: Option<usize>) -> String {
-        format!(
+    fn to_nginx_config(&self, indent: Option<usize>) -> Result<String, ServiceError> {
+        Ok(format!(
             "server {}:{} weight={}{}{};",
             self.target_host,
             self.target_port,
@@ -137,7 +138,7 @@ impl NginxConfigProvider for UpstreamTargetInfo {
             if self.is_backup { " backup" } else { "" },
             if !self.enabled { " down" } else { "" },
         )
-        .indent(indent.unwrap_or(0))
+        .indent(indent.unwrap_or(0)))
     }
 }