diff --git a/frontend/src/app/main/style.clj b/frontend/src/app/main/style.clj
index a1870314af..ea9a0242ad 100644
--- a/frontend/src/app/main/style.clj
+++ b/frontend/src/app/main/style.clj
@@ -97,7 +97,7 @@
              (when cls
                (cond
                  (true? v)  cls
-                 (false? v) nil
+                 (false? v) ""
                  :else     `(if ~v ~cls ""))))))
    (interpose " ")))