diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a6155af..6ed02760 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+SystemJS 4.0.2 (2019/07/08)
+* Fix bug thrown in strict mode. (https://github.com/systemjs/systemjs/commit/21933c378d2750e187699c5e7be2aea8eab57833 @joeldenning)
+
 SystemJS 4.0.1 (2019/07/06)
 * Fix IE11 regression related to loading json files (https://github.com/systemjs/systemjs/pull/1963, @joeldenning)
 * Fix bug where System.import() rejected incorrectly, due to unrelated errors (https://github.com/systemjs/systemjs/pull/1961 @joeldenning)
diff --git a/dist/s.js b/dist/s.js
index d9103d75..a95fee72 100644
--- a/dist/s.js
+++ b/dist/s.js
@@ -1,5 +1,5 @@
 /*
-* SJS 4.0.1
+* SJS 4.0.2
 * Minimal SystemJS Build
 */
 (function () {
@@ -366,7 +366,6 @@
 
   const systemRegister = systemJSPrototype.register;
   systemJSPrototype.register = function (deps, declare) {
-    err = undefined;
     systemRegister.call(this, deps, declare);
   };
 
diff --git a/dist/s.min.js b/dist/s.min.js
index a14d25f2..6bff7811 100644
--- a/dist/s.min.js
+++ b/dist/s.min.js
@@ -1 +1 @@
-!function(){const e="undefined"!=typeof self,n=e?self:global;let t;if("undefined"!=typeof document){const e=document.querySelector("base[href]");e&&(t=e.href)}if(!t&&"undefined"!=typeof location){const e=(t=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==e&&(t=t.slice(0,e+1))}const r=/\\/g,o="undefined"!=typeof Symbol,i=o&&Symbol.toStringTag,c=o?Symbol():"@";function u(){this[c]={}}const s=u.prototype;let l;s.import=function(e,n){const t=this;return Promise.resolve(t.resolve(e,n)).then(function(e){const n=function e(n,t,r){let o=n[c][t];if(o)return o;const u=[],s=Object.create(null);i&&Object.defineProperty(s,i,{value:"Module"});let l=Promise.resolve().then(function(){return n.instantiate(t,r)}).then(function(e){if(!e)throw Error("Module "+t+" did not instantiate");const r=e[1](function(e,n){o.h=!0;let t=!1;if("object"!=typeof e)e in s&&s[e]===n||(s[e]=n,t=!0);else for(let n in e){let r=e[n];n in s&&s[n]===r||(s[n]=r,t=!0)}if(t)for(let e=0;e<u.length;e++)u[e](s);return n},2===e[1].length?{import:function(e){return n.import(e,t)},meta:n.createContext(t)}:void 0);return o.e=r.execute||function(){},[e[0],r.setters||[]]});const f=l.then(function(r){return Promise.all(r[0].map(function(o,i){const c=r[1][i];return Promise.resolve(n.resolve(o,t)).then(function(r){const o=e(n,r,t);return Promise.resolve(o.I).then(function(){return c&&(o.i.push(c),!o.h&&o.I||c(o.n)),o})})})).then(function(e){o.d=e})});return f.catch(function(e){o.e=null,o.er=e}),o=n[c][t]={id:t,i:u,n:s,I:l,L:f,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}(t,e);return n.C||function(e,n){return n.C=function e(n,t,r){if(!r[t.id])return r[t.id]=!0,Promise.resolve(t.L).then(function(){return Promise.all(t.d.map(function(t){return e(n,t,r)}))})}(e,n,{}).then(function(){return function e(n,t,r){if(r[t.id])return;if(r[t.id]=!0,!t.e){if(t.er)throw t.er;return t.E?t.E:void 0}let o;return t.d.forEach(function(t){{const i=e(n,t,r);i&&(o=o||[]).push(i)}}),o?Promise.all(o).then(i):i();function i(){try{let e=t.e.call(f);if(e)return e=e.then(function(){t.C=t.n,t.E=null}),t.E=t.E||e;t.C=t.n}catch(e){throw t.er=e,e}finally{t.L=t.I=void 0,t.e=null}}}(e,n,{})}).then(function(){return n.n})}(t,n)})},s.createContext=function(e){return{url:e}},s.register=function(e,n){l=[e,n]},s.getRegister=function(){const e=l;return l=void 0,e};const f=Object.freeze(Object.create(null));n.System=new u;const d=s.register;s.register=function(e,n){err=void 0,d.call(this,e,n)},s.instantiate=function(e,n){const t=this;return".json"===e.substr(-5)?fetch(e).then(function(e){return e.text()}).then(function(e){return[[],function(n){return{execute:function(){n("default",JSON.parse(e))}}}]}):new Promise(function(r,o){let i;function c(n){n.filename===e&&(i=n.error)}window.addEventListener("error",c);const u=document.createElement("script");u.charset="utf-8",u.async=!0,u.crossOrigin="anonymous",u.addEventListener("error",function(){window.removeEventListener("error",c),o(Error("Error loading "+e+(n?" from "+n:"")))}),u.addEventListener("load",function(){window.removeEventListener("error",c),document.head.removeChild(u),i?o(i):r(t.getRegister())}),u.src=e,document.head.appendChild(u)})},e&&"function"==typeof importScripts&&(s.instantiate=function(e){const n=this;return new Promise(function(t,r){try{importScripts(e)}catch(e){r(e)}t(n.getRegister())})}),s.resolve=function(e,n){const o=function(e,n){if(-1!==e.indexOf("\\")&&(e=e.replace(r,"/")),"/"===e[0]&&"/"===e[1])return n.slice(0,n.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){const t=n.slice(0,n.indexOf(":")+1);let r;if(r="/"===n[t.length+1]?"file:"!==t?(r=n.slice(t.length+2)).slice(r.indexOf("/")+1):n.slice(8):n.slice(t.length+("/"===n[t.length])),"/"===e[0])return n.slice(0,n.length-r.length-1)+e;const o=r.slice(0,r.lastIndexOf("/")+1)+e,i=[];let c=-1;for(let e=0;e<o.length;e++)-1!==c?"/"===o[e]&&(i.push(o.slice(c,e+1)),c=-1):"."===o[e]?"."!==o[e+1]||"/"!==o[e+2]&&e+2!==o.length?"/"===o[e+1]||e+1===o.length?e+=1:c=e:(i.pop(),e+=2):c=e;return-1!==c&&i.push(o.slice(c)),n.slice(0,n.length-r.length)+i.join("")}}(e,n||t);if(!o){if(-1!==e.indexOf(":"))return Promise.resolve(e);throw Error('Cannot resolve "'+e+(n?'" from '+n:'"'))}return Promise.resolve(o)}}();
\ No newline at end of file
+!function(){const e="undefined"!=typeof self,n=e?self:global;let t;if("undefined"!=typeof document){const e=document.querySelector("base[href]");e&&(t=e.href)}if(!t&&"undefined"!=typeof location){const e=(t=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==e&&(t=t.slice(0,e+1))}const r=/\\/g,o="undefined"!=typeof Symbol,i=o&&Symbol.toStringTag,c=o?Symbol():"@";function u(){this[c]={}}const s=u.prototype;let l;s.import=function(e,n){const t=this;return Promise.resolve(t.resolve(e,n)).then(function(e){const n=function e(n,t,r){let o=n[c][t];if(o)return o;const u=[],s=Object.create(null);i&&Object.defineProperty(s,i,{value:"Module"});let l=Promise.resolve().then(function(){return n.instantiate(t,r)}).then(function(e){if(!e)throw Error("Module "+t+" did not instantiate");const r=e[1](function(e,n){o.h=!0;let t=!1;if("object"!=typeof e)e in s&&s[e]===n||(s[e]=n,t=!0);else for(let n in e){let r=e[n];n in s&&s[n]===r||(s[n]=r,t=!0)}if(t)for(let e=0;e<u.length;e++)u[e](s);return n},2===e[1].length?{import:function(e){return n.import(e,t)},meta:n.createContext(t)}:void 0);return o.e=r.execute||function(){},[e[0],r.setters||[]]});const f=l.then(function(r){return Promise.all(r[0].map(function(o,i){const c=r[1][i];return Promise.resolve(n.resolve(o,t)).then(function(r){const o=e(n,r,t);return Promise.resolve(o.I).then(function(){return c&&(o.i.push(c),!o.h&&o.I||c(o.n)),o})})})).then(function(e){o.d=e})});return f.catch(function(e){o.e=null,o.er=e}),o=n[c][t]={id:t,i:u,n:s,I:l,L:f,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}(t,e);return n.C||function(e,n){return n.C=function e(n,t,r){if(!r[t.id])return r[t.id]=!0,Promise.resolve(t.L).then(function(){return Promise.all(t.d.map(function(t){return e(n,t,r)}))})}(e,n,{}).then(function(){return function e(n,t,r){if(r[t.id])return;if(r[t.id]=!0,!t.e){if(t.er)throw t.er;return t.E?t.E:void 0}let o;return t.d.forEach(function(t){{const i=e(n,t,r);i&&(o=o||[]).push(i)}}),o?Promise.all(o).then(i):i();function i(){try{let e=t.e.call(f);if(e)return e=e.then(function(){t.C=t.n,t.E=null}),t.E=t.E||e;t.C=t.n}catch(e){throw t.er=e,e}finally{t.L=t.I=void 0,t.e=null}}}(e,n,{})}).then(function(){return n.n})}(t,n)})},s.createContext=function(e){return{url:e}},s.register=function(e,n){l=[e,n]},s.getRegister=function(){const e=l;return l=void 0,e};const f=Object.freeze(Object.create(null));n.System=new u;const d=s.register;s.register=function(e,n){d.call(this,e,n)},s.instantiate=function(e,n){const t=this;return".json"===e.substr(-5)?fetch(e).then(function(e){return e.text()}).then(function(e){return[[],function(n){return{execute:function(){n("default",JSON.parse(e))}}}]}):new Promise(function(r,o){let i;function c(n){n.filename===e&&(i=n.error)}window.addEventListener("error",c);const u=document.createElement("script");u.charset="utf-8",u.async=!0,u.crossOrigin="anonymous",u.addEventListener("error",function(){window.removeEventListener("error",c),o(Error("Error loading "+e+(n?" from "+n:"")))}),u.addEventListener("load",function(){window.removeEventListener("error",c),document.head.removeChild(u),i?o(i):r(t.getRegister())}),u.src=e,document.head.appendChild(u)})},e&&"function"==typeof importScripts&&(s.instantiate=function(e){const n=this;return new Promise(function(t,r){try{importScripts(e)}catch(e){r(e)}t(n.getRegister())})}),s.resolve=function(e,n){const o=function(e,n){if(-1!==e.indexOf("\\")&&(e=e.replace(r,"/")),"/"===e[0]&&"/"===e[1])return n.slice(0,n.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){const t=n.slice(0,n.indexOf(":")+1);let r;if(r="/"===n[t.length+1]?"file:"!==t?(r=n.slice(t.length+2)).slice(r.indexOf("/")+1):n.slice(8):n.slice(t.length+("/"===n[t.length])),"/"===e[0])return n.slice(0,n.length-r.length-1)+e;const o=r.slice(0,r.lastIndexOf("/")+1)+e,i=[];let c=-1;for(let e=0;e<o.length;e++)-1!==c?"/"===o[e]&&(i.push(o.slice(c,e+1)),c=-1):"."===o[e]?"."!==o[e+1]||"/"!==o[e+2]&&e+2!==o.length?"/"===o[e+1]||e+1===o.length?e+=1:c=e:(i.pop(),e+=2):c=e;return-1!==c&&i.push(o.slice(c)),n.slice(0,n.length-r.length)+i.join("")}}(e,n||t);if(!o){if(-1!==e.indexOf(":"))return Promise.resolve(e);throw Error('Cannot resolve "'+e+(n?'" from '+n:'"'))}return Promise.resolve(o)}}();
\ No newline at end of file
diff --git a/dist/s.min.js.map b/dist/s.min.js.map
index 08fa45b8..2840184e 100644
--- a/dist/s.min.js.map
+++ b/dist/s.min.js.map
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\ No newline at end of file
diff --git a/dist/system.js b/dist/system.js
index e2ad706f..57807cb5 100644
--- a/dist/system.js
+++ b/dist/system.js
@@ -1,5 +1,5 @@
 /*
-* SystemJS 4.0.1
+* SystemJS 4.0.2
 */
 (function () {
   const hasSelf = typeof self !== 'undefined';
@@ -473,7 +473,6 @@
 
   const systemRegister = systemJSPrototype.register;
   systemJSPrototype.register = function (deps, declare) {
-    err = undefined;
     systemRegister.call(this, deps, declare);
   };
 
diff --git a/dist/system.min.js b/dist/system.min.js
index 84d0eade..fd46c5dd 100644
--- a/dist/system.min.js
+++ b/dist/system.min.js
@@ -1,4 +1,4 @@
 /*
-* SystemJS 4.0.1
+* SystemJS 4.0.2
 */
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\ No newline at end of file
diff --git a/package.json b/package.json
index f5135d3b..135b8939 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "systemjs",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "description": "Dynamic ES module loader",
   "repository": {
     "type": "git",