diff --git a/resources/js/build/wordpress.js b/resources/js/build/wordpress.js
index 1671125..d428071 100644
--- a/resources/js/build/wordpress.js
+++ b/resources/js/build/wordpress.js
@@ -210,7 +210,8 @@ export function wordpressThemeJson({
         return;
       }
 
-      const rootContent = themeContent.slice(themeContent.indexOf('{') + 1, themeContent.lastIndexOf('}'))
+      const endIndex = themeContent.lastIndexOf('}');
+      const rootContent = themeContent.slice(themeContent.indexOf('{') + 1, endIndex === -1 ? undefined : endIndex);
       const colorVariables = {}
 
       const colorVarRegex = /--color-([^:]+):\s*([^;}]+)[;}]?/g