diff --git a/lib/env-bundler.js b/lib/env-bundler.js
index 7182b80..c5cf059 100644
--- a/lib/env-bundler.js
+++ b/lib/env-bundler.js
@@ -160,7 +160,7 @@ const componentCodeExtractors = {
     return c.name;
   },
   asset: (c) => {
-      return c.correlationCode;
+    return c.correlationCode;
   },
   group: (c) => {
     return c.name;
@@ -370,7 +370,7 @@ const componentResponseProcessor = {
       'id': [{
         key: 'correlationCode',
         transform: function(id, source) {
-          return source.correlationCode !== undefined ? source.correlationCode : id;
+          return source.correlationCode !== null ? source.correlationCode : id;
         }
       }],
       'type': 'type',
@@ -577,7 +577,7 @@ const processContentAttribute = function(attribute) {
     'id': [{
       key: 'correlationCode',
       transform: function(id, source) {
-        return source.correlationCode !== undefined ? source.correlationCode : id;
+        return source.correlationCode !== null ? source.correlationCode : id;
       }
     }],
     'name': 'name',
@@ -743,6 +743,10 @@ function canonizeCode (code) {
   return code.trim().toLowerCase().replace(new RegExp(' ', 'g'), '-').replace(new RegExp('-+', 'g'), '-');
 }
 
+function canonizeCodeUnderline (code) {
+  return code.trim().toLowerCase().replace(new RegExp('[\\s\\-_]+', 'g'), '_');
+}
+
 const urlEncoder = function (payload) {
   return Object.keys(payload)
     .map((k) => `${k}=${payload[k]}`)
@@ -922,16 +926,18 @@ async function generateBundle (options, components) {
   console.log('Generating bundle...');
 
   const { code, description, location } = options;
-
   const path = location.charAt(location.length - 1) === '/' ? location.slice(0, -1) : location;
 
+  // Filter widget fragments
+  const filteredComponents = await filterWidgetFragments(components);
+
   // Extract used resources
   const resources = await Promise.all(ALL_TYPES.map(async (type) => {
-    if (components[type] === undefined) return [];
+    if (filteredComponents[type] === undefined) return [];
 
     const idExtractor = componentIdExtractors[type];
     const codeExtractor = componentCodeExtractors[type];
-    const cachedComponents = components[type].map(c => componentCache[type].find(cached => idExtractor(cached) === c));
+    const cachedComponents = filteredComponents[type].map(c => componentCache[type].find(cached => idExtractor(cached) === c));
 
     return resourceExtractorByType[type](cachedComponents);
   }));
@@ -942,7 +948,7 @@ async function generateBundle (options, components) {
 
   // Save components descriptors by type
   const results = await Promise.all(ALL_TYPES.map(async (type) => {
-    const descriptors = await saveComponentsDescriptor(type, path, code, components[type]);
+    const descriptors = await saveComponentsDescriptor(type, path, code, filteredComponents[type]);
     return descriptors;
   }));
 
@@ -955,6 +961,12 @@ async function generateBundle (options, components) {
   await saveBundleDescriptor(code, description, path, descriptors);
 }
 
+async function filterWidgetFragments(components) {
+  const widgets = components['widget'].map(w => canonizeCodeUnderline(w));
+  components['fragment'] = components['fragment'].filter(f => !widgets.includes(canonizeCodeUnderline(f)));
+  return components;
+}
+
 async function saveComponentsDescriptor(type, location, bundle_code, componentIds) {
   if (undefined === componentIds) return;