diff --git a/src/parseUtils.js b/src/parseUtils.js
index 16adbe02..f137be2a 100644
--- a/src/parseUtils.js
+++ b/src/parseUtils.js
@@ -86,8 +86,8 @@ function parseBundle(bundlePath) {
 }
 
 function isArgumentContainsChunkIds(arg) {
-  // Array of numeric ids
-  return (arg.type === 'ArrayExpression' && _.every(arg.elements, isNumericId));
+  // Array of numeric or string ids. Chunk IDs are strings when NamedChunksPlugin is used
+  return (arg.type === 'ArrayExpression' && _.every(arg.elements, isModuleId));
 }
 
 function isArgumentContainsModulesList(arg) {
diff --git a/test/bundles/validExtraBundleWithNamedChunk.js b/test/bundles/validExtraBundleWithNamedChunk.js
new file mode 100644
index 00000000..e665944c
--- /dev/null
+++ b/test/bundles/validExtraBundleWithNamedChunk.js
@@ -0,0 +1 @@
+webpackJsonp(["app"],{125:function(n,e,t){console.log("it works");}},[125]);
diff --git a/test/bundles/validExtraBundleWithNamedChunk.modules.json b/test/bundles/validExtraBundleWithNamedChunk.modules.json
new file mode 100644
index 00000000..54963ce9
--- /dev/null
+++ b/test/bundles/validExtraBundleWithNamedChunk.modules.json
@@ -0,0 +1,5 @@
+{
+  "modules": {
+    "125": "{console.log(\"it works\");}"
+  }
+}