diff --git a/src/server.rs b/src/server.rs
index ea4350b..7a7f295 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -255,9 +255,10 @@ impl LanguageServer for Backend {
 
     async fn did_close(&self, params: DidCloseTextDocumentParams) {
         // 获取诊断相关的配置信息，如果 mode 为 common，则需要清空关闭文件的诊断信息
-        let linter_mode = self.server.db.get_lsp_configuration_string_value("digital-ide.function.lsp.linter.mode").unwrap();
-        if linter_mode == "common" {
-            self.client.publish_diagnostics(params.text_document.uri, vec![], None).await;               
+        if let Some(linter_mode) = self.server.db.get_lsp_configuration_string_value("digital-ide.function.lsp.linter.mode") {
+            if linter_mode == "common" {
+                self.client.publish_diagnostics(params.text_document.uri, vec![], None).await;               
+            }
         }
     }