diff --git a/src/core/PsychoJS.js b/src/core/PsychoJS.js
index cb72574..c3b26b2 100644
--- a/src/core/PsychoJS.js
+++ b/src/core/PsychoJS.js
@@ -691,6 +691,13 @@ export class PsychoJS
 		window.onerror = function (message, source, lineno, colno, error)
 		{
 			console.error(error);
+			document.body.setAttribute('data-error', JSON.stringify({
+				message: message,
+				source: source,
+				lineno: lineno,
+				colno: colno,
+				error: error.stack
+			}));
 			self._gui.dialog({"error": error});
 			return true;
 		};