diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9edd77..e85d432 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## 0.32.2
+
+* Do not use `??` operator at the moment.
+
+<br /> <br />
+
+
+
 ## 0.32.1
 
 * Build grid without DOM object.
diff --git a/css-doodle.js b/css-doodle.js
index a5293ad..86fee6e 100644
--- a/css-doodle.js
+++ b/css-doodle.js
@@ -1,4 +1,4 @@
-/*! css-doodle@0.32.1 */
+/*! css-doodle@0.32.2 */
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
   typeof define === 'function' && define.amd ? define(factory) :
@@ -6256,9 +6256,15 @@ void main() {
   `;
   }
 
+  function get_content(input) {
+    return is_nil(input) ? '' : input;
+  }
+
   function create_cell(x, y, z, content, child = '') {
     let id = cell_id(x, y, z);
-    return `<cell id="${id}">${content['#' + id]??''}${child??''}</cell>`;
+    let head = get_content(content['#' + id]);
+    let tail = get_content(child);
+    return `<cell id="${id}">${head}${tail}</cell>`;
   }
 
   function create_grid(grid_obj, content) {
diff --git a/css-doodle.min.js b/css-doodle.min.js
index b6cf46f..8e82861 100644
--- a/css-doodle.min.js
+++ b/css-doodle.min.js
@@ -1 +1 @@
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e){(t.contentBoxSize||t.contentRect)&&r()}})),this.uniform_resolution_observer.observe(this)}}remove_uniform_resolution(){if(this.uniform_resolution_observer){let{uniform_width:e,uniform_height:t}=Nt;this.style.removeProperty("--"+e.name),this.style.removeProperty("--"+t.name),this.uniform_resolution_observer.unobserve(this),this.uniform_resolution_observer=null}}register_uniform_time(){if(!window.CSS||!window.CSS.registerProperty)return!1;if(!this.is_uniform_time_registered){let{uniform_time:e}=Nt;try{CSS.registerProperty({name:"--"+e.name,syntax:"<number>",initialValue:0,inherits:!0})}catch(e){}this.is_uniform_time_registered=!0}}export({scale:e,name:t,download:n,detail:r}={}){return new Promise(((i,s)=>{let o=Nn(this),l=this.doodle.innerHTML,{width:a,height:u}=this.getBoundingClientRect(),c=a*(e=parseInt(e)||1),h=u*e,p=`\n<svg xmlns="http://www.w3.org/2000/svg"\n preserveAspectRatio="none"\n viewBox="0 0 ${a} ${u}"\n ${A()?"":`width="${c}px" height="${h}px"`}><foreignObject 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e){(t.contentBoxSize||t.contentRect)&&r()}})),this.uniform_resolution_observer.observe(this)}}remove_uniform_resolution(){if(this.uniform_resolution_observer){let{uniform_width:e,uniform_height:t}=Nt;this.style.removeProperty("--"+e.name),this.style.removeProperty("--"+t.name),this.uniform_resolution_observer.unobserve(this),this.uniform_resolution_observer=null}}register_uniform_time(){if(!window.CSS||!window.CSS.registerProperty)return!1;if(!this.is_uniform_time_registered){let{uniform_time:e}=Nt;try{CSS.registerProperty({name:"--"+e.name,syntax:"<number>",initialValue:0,inherits:!0})}catch(e){}this.is_uniform_time_registered=!0}}export({scale:e,name:t,download:n,detail:r}={}){return new Promise(((i,s)=>{let o=Nn(this),l=this.doodle.innerHTML,{width:a,height:u}=this.getBoundingClientRect(),c=a*(e=parseInt(e)||1),h=u*e,p=`\n<svg xmlns="http://www.w3.org/2000/svg"\n preserveAspectRatio="none"\n viewBox="0 0 ${a} ${u}"\n ${A()?"":`width="${c}px" height="${h}px"`}><foreignObject width="100%" height="100%"><div\n class="host"\n xmlns="http://www.w3.org/1999/xhtml"\n style="width:${a}px;height:${u}px;"\n><style>.host{${f=o,f.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/"/g,"&quot;")}}</style>${l}</div></foreignObject></svg>`;var f;n||r?function(e,t,n,r){return new Promise(((i,s)=>{let o=`data:image/svg+xml;utf8,${encodeURIComponent(e)}`;function l(){let e=new Image;e.crossOrigin="anonymous",e.src=o,e.onload=()=>{let l=document.createElement("canvas"),a=l.getContext("2d"),u=window.devicePixelRatio||1;1!=r&&(u=1),l.width=t*u,l.height=n*u,a.drawImage(e,0,0,l.width,l.height);try{l.toBlob((e=>{i({blob:e,source:o,url:URL.createObjectURL(e)})}))}catch(e){s(e)}}}A()?E(o,l,200):l()}))}(p,c,h,e).then((({source:e,url:r,blob:s})=>{if(i({width:c,height:h,svg:p,blob:s,source:e}),n){let e=document.createElement("a");e.download=function(e){return(_(e)?Date.now():String(e).replace(/\/.png$/g,""))+".png"}(t),e.href=r,e.click()}})).catch((e=>{s(e)})):i({width:c,height:h,svg:p})}))}set_content(e,t){if(t instanceof Promise)t.then((t=>{this.set_content(e,t)}));else{const n=this.shadowRoot.querySelector(e);n&&(n.styleSheet?n.styleSheet.cssText=t:n.innerHTML=t)}}}customElements.get("css-doodle")||customElements.define("css-doodle",e)}function Mn(){let{uniform_time:e}=Nt;const t=Bt(/grid/).map((e=>`${e}:inherit;`)).join("");return`\n *, *::after, *::before{box-sizing:border-box;animation-play-state:var(--cssd-animation-play-state) !important\n}:host, .host{display:block;visibility:visible;width:auto;height:auto;--${e.name}:0\n}:host([hidden]), .host[hidden]{display:none\n} .container{position:relative;width:100%;height:100%;display:grid;${t}} cell{position:relative;display:grid;place-items:center\n} svg{position:absolute;width:100%;height:100%\n}:host([cssd-paused-animation]){--cssd-animation-play-state:paused;animation-play-state:paused !important\n}`}function On(e){let{x:t,y:n}=e||{};return`\n:host, .host{grid-template-rows:repeat(${n}, 1fr);grid-template-columns:repeat(${t}, 1fr);}`}function Ln(e){return _(e)?"":e}function In(e,t,n,r,i=""){let s=S(e,t,n);return`<cell id="${s}">${Ln(r["#"+s])}${Ln(i)}</cell>`}function Wn(e,t){let{x:n,y:r,z:i}=e||{},s="";if(1==i)for(let e=1;e<=r;++e)for(let r=1;r<=n;++r)s+=In(r,e,1,t);else{let e="";for(let n=i;n>=1;n--){e=In(1,1,n,t,e)}s=e}return`<grid class="container">${s}</grid>`}return P((e=>{if("undefined"!=typeof document){let t=document.createElement("css-doodle");return t.update&&t.update(e),t}}))}));
\ No newline at end of file
diff --git a/package.json b/package.json
index 66bf164..f0a9073 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "css-doodle",
-  "version": "0.32.1",
+  "version": "0.32.2",
   "description": "A web component for drawing patterns with CSS",
   "main": "css-doodle.js",
   "scripts": {
diff --git a/src/index.js b/src/index.js
index d5515dd..ce452d4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -632,9 +632,15 @@ function get_grid_styles(grid_obj) {
   `;
 }
 
+function get_content(input) {
+  return is_nil(input) ? '' : input;
+}
+
 function create_cell(x, y, z, content, child = '') {
   let id = cell_id(x, y, z);
-  return `<cell id="${id}">${content['#' + id]??''}${child??''}</cell>`;
+  let head = get_content(content['#' + id]);
+  let tail = get_content(child);
+  return `<cell id="${id}">${head}${tail}</cell>`;
 }
 
 function create_grid(grid_obj, content) {