diff --git a/cjs/index.js b/cjs/index.js
index b892e68..bef4e7e 100644
--- a/cjs/index.js
+++ b/cjs/index.js
@@ -23,10 +23,8 @@ exports.diffable = diffable;
 const persistent = fragment => {
   const {childNodes} = fragment;
   const {length} = childNodes;
-  // If the fragment has no content
-  // it should return undefined and break
   if (length < 2)
-    return childNodes[0];
+    return length ? childNodes[0] : fragment;
   const nodes = slice.call(childNodes, 0);
   const firstChild = nodes[0];
   const lastChild = nodes[length - 1];
diff --git a/es.js b/es.js
index be3bc82..35db619 100644
--- a/es.js
+++ b/es.js
@@ -1 +1 @@
-var uwire=function(e){"use strict";const{indexOf:t,slice:n}=[];return e.diffable=(e,t)=>111===e.nodeType?1/t<0?t?(({firstChild:e,lastChild:t})=>{const n=document.createRange();return n.setStartAfter(e),n.setEndAfter(t),n.deleteContents(),e})(e):e.lastChild:t?e.valueOf():e.firstChild:e,e.persistent=e=>{const{childNodes:t}=e,{length:r}=t;if(r<2)return t[0];const l=n.call(t,0);return{ELEMENT_NODE:1,nodeType:111,firstChild:l[0],lastChild:l[r-1],valueOf(){if(t.length!==r){let t=0;for(;t<r;)e.appendChild(l[t++])}return e}}},e}({});
+var uwire=function(e){"use strict";const{indexOf:t,slice:n}=[];return e.diffable=(e,t)=>111===e.nodeType?1/t<0?t?(({firstChild:e,lastChild:t})=>{const n=document.createRange();return n.setStartAfter(e),n.setEndAfter(t),n.deleteContents(),e})(e):e.lastChild:t?e.valueOf():e.firstChild:e,e.persistent=e=>{const{childNodes:t}=e,{length:r}=t;if(r<2)return r?t[0]:e;const l=n.call(t,0);return{ELEMENT_NODE:1,nodeType:111,firstChild:l[0],lastChild:l[r-1],valueOf(){if(t.length!==r){let t=0;for(;t<r;)e.appendChild(l[t++])}return e}}},e}({});
diff --git a/esm/index.js b/esm/index.js
index 8749002..958ae50 100644
--- a/esm/index.js
+++ b/esm/index.js
@@ -21,10 +21,8 @@ export const diffable = (node, operation) => node.nodeType === nodeType ?
 export const persistent = fragment => {
   const {childNodes} = fragment;
   const {length} = childNodes;
-  // If the fragment has no content
-  // it should return undefined and break
   if (length < 2)
-    return childNodes[0];
+    return length ? childNodes[0] : fragment;
   const nodes = slice.call(childNodes, 0);
   const firstChild = nodes[0];
   const lastChild = nodes[length - 1];
diff --git a/index.js b/index.js
index 779b154..8f2de82 100644
--- a/index.js
+++ b/index.js
@@ -22,10 +22,8 @@ var uwire = (function (exports) {
   };
   var persistent = function persistent(fragment) {
     var childNodes = fragment.childNodes;
-    var length = childNodes.length; // If the fragment has no content
-    // it should return undefined and break
-
-    if (length < 2) return childNodes[0];
+    var length = childNodes.length;
+    if (length < 2) return length ? childNodes[0] : fragment;
     var nodes = slice.call(childNodes, 0);
     var firstChild = nodes[0];
     var lastChild = nodes[length - 1];
diff --git a/min.js b/min.js
index dfeef04..a26e71e 100644
--- a/min.js
+++ b/min.js
@@ -1 +1 @@
-var uwire=function(e){"use strict";var l=[].slice;return e.diffable=function(e,t){return 111===e.nodeType?1/t<0?t?(n=(r=e).firstChild,i=r.lastChild,(l=document.createRange()).setStartAfter(n),l.setEndAfter(i),l.deleteContents(),n):e.lastChild:t?e.valueOf():e.firstChild:e;var r,n,i,l},e.persistent=function(t){var r=t.childNodes,n=r.length;if(n<2)return r[0];var i=l.call(r,0);return{ELEMENT_NODE:1,nodeType:111,firstChild:i[0],lastChild:i[n-1],valueOf:function(){if(r.length!==n)for(var e=0;e<n;)t.appendChild(i[e++]);return t}}},e}({});
\ No newline at end of file
+var uwire=function(e){"use strict";var t=[].slice;return e.diffable=function(e,t){return 111===e.nodeType?1/t<0?t?function(e){var t=e.firstChild,r=e.lastChild,n=document.createRange();return n.setStartAfter(t),n.setEndAfter(r),n.deleteContents(),t}(e):e.lastChild:t?e.valueOf():e.firstChild:e},e.persistent=function(e){var r=e.childNodes,n=r.length;if(n<2)return n?r[0]:e;var i=t.call(r,0);return{ELEMENT_NODE:1,nodeType:111,firstChild:i[0],lastChild:i[n-1],valueOf:function(){if(r.length!==n)for(var t=0;t<n;)e.appendChild(i[t++]);return e}}},e}({});
\ No newline at end of file
diff --git a/package.json b/package.json
index 8a87a21..cf4d879 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "cjs": "ascjs esm cjs",
     "rollup:es": "rollup --config rollup/es.config.js",
     "rollup:babel": "rollup --config rollup/babel.config.js",
-    "min": "uglifyjs index.js --support-ie8 --comments=/^!/ -c -m -o min.js",
+    "min": "terser index.js --comments=/^!/ -c -m -o min.js",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "test": "nyc node test/index.js"
   },
@@ -21,17 +21,17 @@
   "author": "Andrea Giammarchi",
   "license": "ISC",
   "devDependencies": {
-    "@babel/core": "^7.8.7",
-    "@babel/preset-env": "^7.8.7",
-    "ascjs": "^3.1.2",
-    "basichtml": "^2.1.4",
-    "coveralls": "^3.0.9",
-    "nyc": "^15.0.0",
-    "rollup": "^2.0.5",
+    "@babel/core": "^7.11.4",
+    "@babel/preset-env": "^7.11.0",
+    "ascjs": "^4.0.1",
+    "basichtml": "^2.3.0",
+    "coveralls": "^3.1.0",
+    "nyc": "^15.1.0",
+    "rollup": "^2.26.5",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-node-resolve": "^5.2.0",
-    "rollup-plugin-terser": "^5.3.0",
-    "uglify-js": "^3.8.0"
+    "rollup-plugin-terser": "^7.0.0",
+    "terser": "^5.2.1"
   },
   "module": "./esm/index.js",
   "type": "module",
diff --git a/test/index.js b/test/index.js
index 446ce30..a6287f7 100644
--- a/test/index.js
+++ b/test/index.js
@@ -3,7 +3,10 @@ const {document} = require('basichtml').init();
 const {diffable, persistent} = require('../cjs');
 
 const fragmentSingle = document.createDocumentFragment();
-fragmentSingle.appendChild(document.createTextNode('a'));
+console.assert(persistent(fragmentSingle) === fragmentSingle, 'no childNodes');
+
+const a = fragmentSingle.appendChild(document.createTextNode('a'));
+console.assert(persistent(fragmentSingle) === a, 'a childNode');
 
 const fragmentMulti = document.createDocumentFragment();
 fragmentMulti.appendChild(document.createTextNode('a'));