diff --git a/index.js b/index.js
index 8b254a6..82f7939 100644
--- a/index.js
+++ b/index.js
@@ -23,7 +23,8 @@ module.exports = class EmitAllPlugin {
                     if (this.shouldIgnore(absolutePath)) return;
 
                     // Used for vendor chunk
-                    if (mod.constructor.name === 'MultiModule') return;
+                    // Excludes MultiModules as well as ContextModules
+                    if (!mod._source) return;
 
                     const source = mod._source._value;
                     const projectRoot = compiler.context;