diff --git a/src/app_state.rs b/src/app_state.rs
index 0fc34a7..bd7b4e3 100644
--- a/src/app_state.rs
+++ b/src/app_state.rs
@@ -56,7 +56,7 @@ pub struct AppState {
     pub schedule: Mutex<Option<Schedule>>,
     pub database: Mutex<PgConnection>,
     pub vk_id: VkId,
-    pub fcm_client: Mutex<FCMClient>,
+    pub fcm_client: Option<Mutex<FCMClient>>, // в рантайме не меняется, так что опционален мьютекс, а не данные в нём.
 }
 
 impl AppState {
@@ -71,7 +71,13 @@ impl AppState {
                     .unwrap_or_else(|_| panic!("Error connecting to {}", database_url)),
             ),
             vk_id: VkId::new(),
-            fcm_client: Mutex::new(FCMClient::new().await.expect("FCM client must be created")),
+            fcm_client: if env::var("GOOGLE_APPLICATION_CREDENTIALS").is_ok() {
+                Some(Mutex::new(
+                    FCMClient::new().await.expect("FCM client must be created"),
+                ))
+            } else {
+                None
+            },
         }
     }
 }
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index 04781dc..91b9581 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -567,6 +567,8 @@ fn convert_groups_to_teachers(
 /// # Examples
 ///
 /// ```
+/// use schedule_parser_rusted::parser::parse_xls;
+///
 /// let result = parse_xls(&include_bytes!("../../schedule.xls").to_vec());
 ///
 /// assert!(result.is_ok());
diff --git a/src/routes/fcm/set_token.rs b/src/routes/fcm/set_token.rs
index 6ce1faf..d447553 100644
--- a/src/routes/fcm/set_token.rs
+++ b/src/routes/fcm/set_token.rs
@@ -78,6 +78,8 @@ pub async fn set_token(
     // Subscribe to default topics.
     if let Some(e) = app_state
         .fcm_client
+        .as_ref()
+        .unwrap()
         .async_scope(
             async |client: &mut FCMClient| -> Result<(), TopicManagementError> {
                 let mut tokens: Vec<String> = Vec::new();