diff --git a/client/src/client/workers/test-evaluator.js b/client/src/client/workers/test-evaluator.js
index 6e9090ac86b..228d2e93ef7 100644
--- a/client/src/client/workers/test-evaluator.js
+++ b/client/src/client/workers/test-evaluator.js
@@ -6,16 +6,14 @@ const oldLog = self.console.log.bind(self.console);
 self.console.log = function proxyConsole(...args) {
   self.postMessage({
     type: 'LOG',
-    data: args.map(log => JSON.stringify(log)).join(' ')
+    data: args.map(arg => JSON.stringify(arg)).join(' ')
   });
   return oldLog(...args);
 };
 
 self.onmessage = async e => {
   /* eslint-disable no-unused-vars */
-  const {
-    code = ''
-  } = e.data;
+  const { code = '' } = e.data;
   const assert = chai.assert;
   // Fake Deep Equal dependency
   const DeepEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b);
diff --git a/client/src/templates/Challenges/utils/frame.js b/client/src/templates/Challenges/utils/frame.js
index f861580875b..0e76da880ef 100644
--- a/client/src/templates/Challenges/utils/frame.js
+++ b/client/src/templates/Challenges/utils/frame.js
@@ -84,7 +84,7 @@ const mountFrame = document => ({ element, ...rest }) => {
 const buildProxyConsole = proxyLogger => ctx => {
   const oldLog = ctx.window.console.log.bind(ctx.window.console);
   ctx.window.console.log = function proxyConsole(...args) {
-    proxyLogger(args);
+    proxyLogger(args.map(arg => JSON.stringify(arg)).join(' '));
     return oldLog(...args);
   };
   return ctx;