diff --git a/app/.gitignore b/app/.gitignore
index 457db69..8402ee1 100644
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -50,3 +50,5 @@ Thumbs.db
 
 # test-time: code service
 dist-codeservice
+
+/source_maps
diff --git a/app/uglify-assets.js b/app/uglify-assets.js
index 897f77d..7d16ccf 100644
--- a/app/uglify-assets.js
+++ b/app/uglify-assets.js
@@ -4,6 +4,9 @@ const path = require("path");
 
 const asset_script_path = "dist/assets/scripts/";
 const map_path = "source_maps";
+if (!fs.existsSync(path.join(__dirname, map_path))) {
+  fs.mkdirSync(path.join(__dirname, map_path));
+}
 
 const options = {
   compress: {