diff --git a/index.js b/index.js
index e8717f8..c384c0b 100644
--- a/index.js
+++ b/index.js
@@ -101,7 +101,9 @@ function parseOpts (opts) {
         .map(function (f) {
           try {
             return fs.readFileSync(path.join(root, f), 'utf8')
-          } catch (err) {}
+          } catch (err) {
+            return null
+          }
         })
         .filter(Boolean)