diff --git a/client/utils/consoleUtils.js b/client/utils/consoleUtils.js
index a6013924..19e942e8 100644
--- a/client/utils/consoleUtils.js
+++ b/client/utils/consoleUtils.js
@@ -38,6 +38,22 @@ export const hijackConsoleErrorsScript = (offs) => {
         }], '*');
       return false;
     };
+    // catch rejected promises
+    window.onunhandledrejection = function (event) {
+      if (event.reason && event.reason.message && event.reason.stack){
+        var errorNum = event.reason.stack.split('about:srcdoc:')[1].split(':')[0];
+        var fileInfo = getScriptOff(errorNum);
+        var data = event.reason.message + ' (' + fileInfo[1] + ': line ' + fileInfo[0] + ')';
+        window.parent.postMessage([{
+          log: [{
+            method: 'error',
+            data: [data],
+            id: Date.now().toString()
+          }],
+          source: fileInfo[1]
+        }], '*');
+      }
+    };
   `;
   return s;
 };
@@ -46,7 +62,7 @@ export const startTag = '@fs-';
 
 export const getAllScriptOffsets = (htmlFile) => {
   const offs = [];
-  const hijackConsoleErrorsScriptLength = 36;
+  const hijackConsoleErrorsScriptLength = 52;
   const embeddedJSStart = 'script crossorigin=""';
   let foundJSScript = true;
   let foundEmbeddedJS = true;