diff --git a/render.js b/render.js
index 72f0e1f..d10f5b1 100644
--- a/render.js
+++ b/render.js
@@ -206,6 +206,7 @@ const do_pug = (prt, root) => async tree => {
 }
 
 const rm_tree = t => {
+  if (t == null) return
   if (t.type == 'file') {
     log('[do_clean] file', t.path)
     return fs.unlink(t.path)
@@ -219,7 +220,11 @@ const rm_tree = t => {
     })
 }
 
-const do_clean = path => tree => walk(path).then(rm_tree).then(_ => tree)
+const do_clean = path => tree => 
+  walk(path)
+    .catch(_ => null)
+    .then(rm_tree)
+    .then(_ => tree)
   
 const conf = { src: './src', dest: './static'}
 walk(conf.src)