diff --git a/src/cobertura.js b/src/cobertura.js
index 73758f79..c276319d 100644
--- a/src/cobertura.js
+++ b/src/cobertura.js
@@ -13,6 +13,7 @@ async function processCoverage(path, options) {
   const { packages } = coverage;
   const classes = processPackages(packages);
   const files = classes
+    .filter(Boolean)
     .map(klass => {
       return {
         ...calculateRates(klass),