diff --git a/index.js b/index.js
index 4d9dfd2..53b5cd6 100644
--- a/index.js
+++ b/index.js
@@ -217,7 +217,7 @@
     var references = new WeakMap();
 
     function getReference(key) {
-        return getValueInMap(key, references);
+        return getValueInMap(key, references) || null;
     }
 
     function getValue(self) {
diff --git a/index.min.js b/index.min.js
index 577e5b1..757c84c 100644
--- a/index.min.js
+++ b/index.min.js
@@ -23,4 +23,4 @@
  * SOFTWARE.
  *
  */
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).TextEditor=t()}(this,(function(){"use strict";var e=function(e,t){return-1!==t.indexOf(e)},t=function(e){return Array.isArray(e)},r=function(e){return"function"==typeof e},n=function(e,t){return e&&u(t)&&e instanceof t},i=function(e){return o(e)&&0==e%1},o=function(e){return"number"==typeof e},c=function(e,t){return void 0===t&&(t=!0),"object"==typeof e&&(!t||n(e,Object))},u=function(e){return function(e){return void 0!==e}(e)&&!function(e){return null===e}(e)},a=function(e){return"string"==typeof e},s=function(e){return e.length},f=function(){for(var r=arguments.length,n=Array(r),i=0;i<r;i++)n[i]=arguments[i];for(var o=n.shift(),a=0,l=s(n);a<l;++a)for(var v in n[a])if(u(o[v]))if(t(o[v])&&t(n[a][v])){o[v]=[].concat(o[v]);for(var h=0,p=s(n[a][v]);h<p;++h)e(n[a][v][h],o[v])||o[v].push(n[a][v][h])}else c(o[v])&&c(n[a][v])?o[v]=f({},o[v],n[a][v]):o[v]=n[a][v];else o[v]=n[a][v];return o},l=document,v=window,h=l.body,p=l.documentElement,d=function(e,t){return e.classList.contains(t)},m=function(e,t){return void 0===t&&(t=""),e.replace(b("["+t+g.replace(/./g,"\\$&")+"]"),"\\$&")},b=function(e,t){return function(e){return n(e,RegExp)}(e)?e:RegExp(e,u(t)?t:"g")},g="!$^*()+=[]{}|:<>,.?/-";var y,$=function(e,t,r){t.removeEventListener(e,r)},w=function(e,t,r,n){void 0===n&&(n=!1),t.addEventListener(e,r,n)},_={blur:0,click:0,copy:0,cut:0,focus:0,input:0,keydown:"key.down",keyup:"key.up",mousedown:"caret.down",mouseenter:"caret.enter",mouseleave:"caret.exit",mousemove:"caret.move",mouseup:"caret.up",paste:0,scroll:0,touchend:"caret.up",touchmove:"caret.move",touchstart:"caret.down",wheel:"scroll"},k=new WeakMap;function E(e){return t=e,k.get(t);var t}function x(e){return(e.value||"").replace(/\r/g,"")}function L(e){return e.disabled}function S(e,t){e.value=t}function T(e,t){return(e||"")["trim"+(-1===t?"Left":1===t?"Right":"")]()}function O(e,t){var r,o,c,s,l=this;return e?n(l,O)?(r=e,o=function(e,t){return(t=t||e).fire=function(e,t,r){var n=this,i=n.hooks;return u(i[e])?(i[e].forEach((function(e){return e.apply(r||n,t)})),n):n},t.off=function(e,t){var r=this,n=r.hooks;if(!u(e))return n={},r;if(u(n[e]))if(u(t)){var i=n[e].length;if(0===i)delete n[e];else for(var o=0;o<i;++o)if(t===n[e][o]){n[e].splice(o,1);break}}else delete n[e];return r},t.on=function(e,t){var r=this.hooks;return u(r[e])||(r[e]=[]),u(t)&&r[e].push(t),this},e.hooks={},e}(l,O.prototype),c=r,s=o,k.set(c,s),l.attach(e,f({},O.state,i(t)||a(t)?{tab:t}:t||{}))):new O(e,t):l}function j(e){var t=E(this),r=e.type,n=x(this);n!==y&&(y=n,t.fire("change")),t.fire(_[r]||r,[e])}O.esc=m,O.from=function(e,t){return new O(e,t)},O.of=E,O.state={n:"text-editor",tab:"\t",with:[]},O.S=function(e,t,r){var n=this,i=r.slice(e,t);n.after=r.slice(t),n.before=r.slice(0,e),n.end=t,n.length=s(i),n.start=e,n.value=i,n.toString=function(){return i}},O.version="4.2.3",O.x=g,Object.defineProperty(O,"name",{value:"TextEditor"});var A=O.prototype;return A.$=function(){var e=this.self;return new O.S(e.selectionStart,e.selectionEnd,x(e))},A.attach=function(e,n){var o=this;if(e=e||o.self,n&&(i(n)||a(n))&&(n={tab:n}),n=f({},o.state,n||{}),d(e,n.n+"__self"))return o;for(var l in o._active=!L(e)&&!function(e){return e.readOnly}(e),o._value=x(e),o.self=e,o.state=n,_)w(l,e,j);if(function(e,t){e.classList.add(t)}(e,n.n+"__self"),u(n)&&t(n.with))for(var v=0,h=s(n.with);v<h;++v){var p=n.with[v];a(p)&&(p=O[p]),r(p)?p.call(o,e,n):c(p)&&r(p.attach)&&p.attach.call(o,e,n)}return o},A.blur=function(){return this.self.blur()},A.detach=function(){var e=this,n=e.self,i=e.state;if(!d(n,i.n+"__self"))return e;for(var o in e._active=!1,_)$(o,n,j);if(function(e,t){e.classList.remove(t)}(n,i.n+"__self"),t(i.with))for(var u=0,f=s(i.with);u<f;++u){var l=i.with[u];a(l)&&(l=O[l]),c(l)&&r(l.detach)&&l.detach.call(e,n,i)}return e},A.focus=function(e){var t,r,n=this,i=n._active,o=n.self;return i?(-1===e?t=r=0:1===e&&(t=s(x(o)),r=o.scrollHeight),u(t)&&u(r)&&(o.selectionStart=o.selectionEnd=t,o.scrollTop=r),o.focus(),n):(o.focus(),n)},A.get=function(){var e=this._active,t=this.self;return!!e&&(!L(t)&&x(t)||null)},A.insert=function(e,t,r){var n=this,i=/^[\s\S]*?$/;return n._active?(r&&n.replace(i,""),-1===t?i=/$/:1===t&&(i=/^/),n.replace(i,e,t)):n},A.let=function(){var e=this,t=e._active,r=e.self;return t?(S(r,e._value),e):e},A.match=function(e,n){var i=this,o=i.$(),c=o.after,u=o.before,a=o.value;if(t(e)){var s=[u.match(e[0]),a.match(e[1]),c.match(e[2])];return r(n)?n.call(i,s[0]||[],s[1]||[],s[2]||[]):[!!s[0],!!s[1],!!s[2]]}var f=a.match(e);return r(n)?n.call(i,f||[]):!!f},A.peel=function(e,t,r){var n=this,i=n.$(),o=i.after,c=i.before,u=i.value;e=m(e),t=m(t);var a=b(e+"$",""),f=b("^"+t,"");return r?n.replace(b("^"+e+"([\\s\\S]*?)"+t+"$",""),"$1"):a.test(c)&&f.test(o)?(c=c.replace(a,""),o=o.replace(f,""),n.set(c+u+o).select(c=s(c),c+s(u))):n.select()},A.pull=function(e,t){void 0===t&&(t=!0);var r=this,n=r.state,o=r.$(),c=o.before,a=o.end,f=o.length,l=o.start,v=o.value;return i(e=u(e)?e:n.tab)&&(e=" ".repeat(e)),""!==c&&"\n"!==c.slice(-1)&&e!==c.slice(-s(e))&&r.select(l-=s(c.split("\n").pop()),f?a:l),e=m(e),f?t?r.replace(b("^"+e,"gm"),""):r.insert(v.split("\n").map((function(t){return b("^("+e+")*$","").test(t)?t:t.replace(b("^"+e,""),"")})).join("\n")):r.replace(b(e+"$",""),"",-1)},A.push=function(e,t){void 0===t&&(t=!1);var r=this,n=r.state,o=r.$(),c=o.before,a=o.end,f=o.length,l=o.start;return i(e=u(e)?e:n.tab)&&(e=" ".repeat(e)),""!==c&&"\n"!==c.slice(-1)&&e!==c.slice(-s(e))&&r.select(l-=s(c.split("\n").pop()),f?a:l),f?r.replace(b("^"+(t?"":"(?!$)"),"gm"),e):r.insert(e,-1)},A.replace=function(e,t,r){var n=this.$(),i=n.after,o=n.before,c=n.value;return-1===r?o=o.replace(e,t):1===r?i=i.replace(e,t):c=c.replace(e,t),this.set(o+c+i).select(o=s(o),o+s(c))},A.select=function(){var e=this,t=e._active,r=e.self;if(!t)return r.focus(),e;for(var n=arguments.length,i=Array(n),o=0;o<n;o++)i[o]=arguments[o];var c,u,a,f,l=s(i),d=e.$(),m=d.start,b=d.end;if(c=v.pageXOffset||p.scrollLeft||h.scrollLeft,u=v.pageYOffset||p.scrollTop||h.scrollTop,a=r.scrollLeft,f=r.scrollTop,0===l)i[0]=m,i[1]=b;else if(1===l){if(!0===i[0])return r.focus(),r.select(),e;i[1]=i[0]}return r.focus(),r.selectionStart=i[0],r.selectionEnd=i[1],r.scrollLeft=a,r.scrollTop=f,v.scroll(c,u),e},A.set=function(e){var t=this,r=t._active,n=t.self;return r?(S(n,e),t):t},A.trim=function(e,t,r,n,i){void 0===i&&(i=!0),null!==e&&!1!==e&&(e=e||""),null!==t&&!1!==t&&(t=t||""),null!==r&&!1!==r&&(r=r||""),null!==n&&!1!==n&&(n=n||"");var o=this.$(),c=o.after,u=o.before,a=o.value,f=T(c,-1),l=T(u,1);return c=!1!==t?(f||!i?t:"")+T(c,-1):c,u=!1!==e?T(u,1)+(l||!i?e:""):u,!1!==n&&(a=T(a,1)),!1!==r&&(a=T(a,-1)),this.set(u+a+c).select(u=s(u),u+s(a))},A.wrap=function(e,t,r){var n=this,i=n.$(),o=i.after,c=i.before,u=i.value;return r?n.replace(/^[\s\S]*?$/,e+"$&"+t):n.set(c+e+u+t+o).select(c=s(c+e),c+s(u))},Object.defineProperty(A,"value",{get:function(){return x(this.self)},set:function(e){S(this.self,e)}}),O}));
\ No newline at end of file
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).TextEditor=t()}(this,(function(){"use strict";var e=function(e,t){return-1!==t.indexOf(e)},t=function(e){return Array.isArray(e)},r=function(e){return"function"==typeof e},n=function(e,t){return e&&u(t)&&e instanceof t},i=function(e){return o(e)&&0==e%1},o=function(e){return"number"==typeof e},c=function(e,t){return void 0===t&&(t=!0),"object"==typeof e&&(!t||n(e,Object))},u=function(e){return function(e){return void 0!==e}(e)&&!function(e){return null===e}(e)},a=function(e){return"string"==typeof e},s=function(e){return e.length},f=function(){for(var r=arguments.length,n=Array(r),i=0;i<r;i++)n[i]=arguments[i];for(var o=n.shift(),a=0,l=s(n);a<l;++a)for(var v in n[a])if(u(o[v]))if(t(o[v])&&t(n[a][v])){o[v]=[].concat(o[v]);for(var h=0,p=s(n[a][v]);h<p;++h)e(n[a][v][h],o[v])||o[v].push(n[a][v][h])}else c(o[v])&&c(n[a][v])?o[v]=f({},o[v],n[a][v]):o[v]=n[a][v];else o[v]=n[a][v];return o},l=document,v=window,h=l.body,p=l.documentElement,d=function(e,t){return e.classList.contains(t)},m=function(e,t){return void 0===t&&(t=""),e.replace(b("["+t+g.replace(/./g,"\\$&")+"]"),"\\$&")},b=function(e,t){return function(e){return n(e,RegExp)}(e)?e:RegExp(e,u(t)?t:"g")},g="!$^*()+=[]{}|:<>,.?/-";var y,$=function(e,t,r){t.removeEventListener(e,r)},w=function(e,t,r,n){void 0===n&&(n=!1),t.addEventListener(e,r,n)},_={blur:0,click:0,copy:0,cut:0,focus:0,input:0,keydown:"key.down",keyup:"key.up",mousedown:"caret.down",mouseenter:"caret.enter",mouseleave:"caret.exit",mousemove:"caret.move",mouseup:"caret.up",paste:0,scroll:0,touchend:"caret.up",touchmove:"caret.move",touchstart:"caret.down",wheel:"scroll"},k=new WeakMap;function E(e){return t=e,k.get(t)||null;var t}function x(e){return(e.value||"").replace(/\r/g,"")}function L(e){return e.disabled}function S(e,t){e.value=t}function T(e,t){return(e||"")["trim"+(-1===t?"Left":1===t?"Right":"")]()}function O(e,t){var r,o,c,s,l=this;return e?n(l,O)?(r=e,o=function(e,t){return(t=t||e).fire=function(e,t,r){var n=this,i=n.hooks;return u(i[e])?(i[e].forEach((function(e){return e.apply(r||n,t)})),n):n},t.off=function(e,t){var r=this,n=r.hooks;if(!u(e))return n={},r;if(u(n[e]))if(u(t)){var i=n[e].length;if(0===i)delete n[e];else for(var o=0;o<i;++o)if(t===n[e][o]){n[e].splice(o,1);break}}else delete n[e];return r},t.on=function(e,t){var r=this.hooks;return u(r[e])||(r[e]=[]),u(t)&&r[e].push(t),this},e.hooks={},e}(l,O.prototype),c=r,s=o,k.set(c,s),l.attach(e,f({},O.state,i(t)||a(t)?{tab:t}:t||{}))):new O(e,t):l}function j(e){var t=E(this),r=e.type,n=x(this);n!==y&&(y=n,t.fire("change")),t.fire(_[r]||r,[e])}O.esc=m,O.from=function(e,t){return new O(e,t)},O.of=E,O.state={n:"text-editor",tab:"\t",with:[]},O.S=function(e,t,r){var n=this,i=r.slice(e,t);n.after=r.slice(t),n.before=r.slice(0,e),n.end=t,n.length=s(i),n.start=e,n.value=i,n.toString=function(){return i}},O.version="4.2.3",O.x=g,Object.defineProperty(O,"name",{value:"TextEditor"});var A=O.prototype;return A.$=function(){var e=this.self;return new O.S(e.selectionStart,e.selectionEnd,x(e))},A.attach=function(e,n){var o=this;if(e=e||o.self,n&&(i(n)||a(n))&&(n={tab:n}),n=f({},o.state,n||{}),d(e,n.n+"__self"))return o;for(var l in o._active=!L(e)&&!function(e){return e.readOnly}(e),o._value=x(e),o.self=e,o.state=n,_)w(l,e,j);if(function(e,t){e.classList.add(t)}(e,n.n+"__self"),u(n)&&t(n.with))for(var v=0,h=s(n.with);v<h;++v){var p=n.with[v];a(p)&&(p=O[p]),r(p)?p.call(o,e,n):c(p)&&r(p.attach)&&p.attach.call(o,e,n)}return o},A.blur=function(){return this.self.blur()},A.detach=function(){var e=this,n=e.self,i=e.state;if(!d(n,i.n+"__self"))return e;for(var o in e._active=!1,_)$(o,n,j);if(function(e,t){e.classList.remove(t)}(n,i.n+"__self"),t(i.with))for(var u=0,f=s(i.with);u<f;++u){var l=i.with[u];a(l)&&(l=O[l]),c(l)&&r(l.detach)&&l.detach.call(e,n,i)}return e},A.focus=function(e){var t,r,n=this,i=n._active,o=n.self;return i?(-1===e?t=r=0:1===e&&(t=s(x(o)),r=o.scrollHeight),u(t)&&u(r)&&(o.selectionStart=o.selectionEnd=t,o.scrollTop=r),o.focus(),n):(o.focus(),n)},A.get=function(){var e=this._active,t=this.self;return!!e&&(!L(t)&&x(t)||null)},A.insert=function(e,t,r){var n=this,i=/^[\s\S]*?$/;return n._active?(r&&n.replace(i,""),-1===t?i=/$/:1===t&&(i=/^/),n.replace(i,e,t)):n},A.let=function(){var e=this,t=e._active,r=e.self;return t?(S(r,e._value),e):e},A.match=function(e,n){var i=this,o=i.$(),c=o.after,u=o.before,a=o.value;if(t(e)){var s=[u.match(e[0]),a.match(e[1]),c.match(e[2])];return r(n)?n.call(i,s[0]||[],s[1]||[],s[2]||[]):[!!s[0],!!s[1],!!s[2]]}var f=a.match(e);return r(n)?n.call(i,f||[]):!!f},A.peel=function(e,t,r){var n=this,i=n.$(),o=i.after,c=i.before,u=i.value;e=m(e),t=m(t);var a=b(e+"$",""),f=b("^"+t,"");return r?n.replace(b("^"+e+"([\\s\\S]*?)"+t+"$",""),"$1"):a.test(c)&&f.test(o)?(c=c.replace(a,""),o=o.replace(f,""),n.set(c+u+o).select(c=s(c),c+s(u))):n.select()},A.pull=function(e,t){void 0===t&&(t=!0);var r=this,n=r.state,o=r.$(),c=o.before,a=o.end,f=o.length,l=o.start,v=o.value;return i(e=u(e)?e:n.tab)&&(e=" ".repeat(e)),""!==c&&"\n"!==c.slice(-1)&&e!==c.slice(-s(e))&&r.select(l-=s(c.split("\n").pop()),f?a:l),e=m(e),f?t?r.replace(b("^"+e,"gm"),""):r.insert(v.split("\n").map((function(t){return b("^("+e+")*$","").test(t)?t:t.replace(b("^"+e,""),"")})).join("\n")):r.replace(b(e+"$",""),"",-1)},A.push=function(e,t){void 0===t&&(t=!1);var r=this,n=r.state,o=r.$(),c=o.before,a=o.end,f=o.length,l=o.start;return i(e=u(e)?e:n.tab)&&(e=" ".repeat(e)),""!==c&&"\n"!==c.slice(-1)&&e!==c.slice(-s(e))&&r.select(l-=s(c.split("\n").pop()),f?a:l),f?r.replace(b("^"+(t?"":"(?!$)"),"gm"),e):r.insert(e,-1)},A.replace=function(e,t,r){var n=this.$(),i=n.after,o=n.before,c=n.value;return-1===r?o=o.replace(e,t):1===r?i=i.replace(e,t):c=c.replace(e,t),this.set(o+c+i).select(o=s(o),o+s(c))},A.select=function(){var e=this,t=e._active,r=e.self;if(!t)return r.focus(),e;for(var n=arguments.length,i=Array(n),o=0;o<n;o++)i[o]=arguments[o];var c,u,a,f,l=s(i),d=e.$(),m=d.start,b=d.end;if(c=v.pageXOffset||p.scrollLeft||h.scrollLeft,u=v.pageYOffset||p.scrollTop||h.scrollTop,a=r.scrollLeft,f=r.scrollTop,0===l)i[0]=m,i[1]=b;else if(1===l){if(!0===i[0])return r.focus(),r.select(),e;i[1]=i[0]}return r.focus(),r.selectionStart=i[0],r.selectionEnd=i[1],r.scrollLeft=a,r.scrollTop=f,v.scroll(c,u),e},A.set=function(e){var t=this,r=t._active,n=t.self;return r?(S(n,e),t):t},A.trim=function(e,t,r,n,i){void 0===i&&(i=!0),null!==e&&!1!==e&&(e=e||""),null!==t&&!1!==t&&(t=t||""),null!==r&&!1!==r&&(r=r||""),null!==n&&!1!==n&&(n=n||"");var o=this.$(),c=o.after,u=o.before,a=o.value,f=T(c,-1),l=T(u,1);return c=!1!==t?(f||!i?t:"")+T(c,-1):c,u=!1!==e?T(u,1)+(l||!i?e:""):u,!1!==n&&(a=T(a,1)),!1!==r&&(a=T(a,-1)),this.set(u+a+c).select(u=s(u),u+s(a))},A.wrap=function(e,t,r){var n=this,i=n.$(),o=i.after,c=i.before,u=i.value;return r?n.replace(/^[\s\S]*?$/,e+"$&"+t):n.set(c+e+u+t+o).select(c=s(c+e),c+s(u))},Object.defineProperty(A,"value",{get:function(){return x(this.self)},set:function(e){S(this.self,e)}}),O}));
\ No newline at end of file
diff --git a/index.mjs b/index.mjs
index 850468c..5242322 100644
--- a/index.mjs
+++ b/index.mjs
@@ -32,7 +32,7 @@ const name = 'TextEditor';
 const references = new WeakMap;
 
 function getReference(key) {
-    return getValueInMap(key, references);
+    return getValueInMap(key, references) || null;
 }
 
 function getValue(self) {