diff --git a/packages/tailwindcss-language-server/src/server.ts b/packages/tailwindcss-language-server/src/server.ts
index d40adf6..ca3ae14 100644
--- a/packages/tailwindcss-language-server/src/server.ts
+++ b/packages/tailwindcss-language-server/src/server.ts
@@ -381,7 +381,7 @@ async function createProjectService(
     editor: {
       connection,
       folder,
-      userLanguages: params.initializationOptions.userLanguages
+      userLanguages: params.initializationOptions?.userLanguages
         ? params.initializationOptions.userLanguages
         : {},
       // TODO