diff --git a/src/lib/does-chunk-belong-to-html.js b/src/lib/does-chunk-belong-to-html.js
index 4c9cc09..6d72291 100644
--- a/src/lib/does-chunk-belong-to-html.js
+++ b/src/lib/does-chunk-belong-to-html.js
@@ -47,6 +47,7 @@ function recursiveChunkEntryName (chunk) {
 }
 
 function _recursiveChunkGroup (chunkGroup) {
+  if (!chunkGroup) return undefined;
   if (chunkGroup instanceof EntryPoint) {
     return chunkGroup.name
   } else {