Blue screen of death when theres an error

main.css

@@ -145,6 +145,39 @@ body.iOS div.hint {
   visibility: visible;
 }
 
+#bsodmom {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  text-align: center;
+  vertical-align: middle;
+  display: none;
+}
+#bsod {
+  width: 500px;
+  background-color: #008;
+  color: white;
+  font-family: courier, monospace;
+  font-size: 14px;
+  margin: auto;
+  margin-top: 100px;
+  padding: 40px;
+}
+#bsod p {
+  text-align: left;
+  margin: 1em;
+}
+#bsod p.c {
+  text-align: center !IMPORTANT;
+}
+#bsod p.c span {
+  background: silver;
+  color: #008;
+}
+
+
 div#paused {
   display: none;
   position: absolute;

main.html

@@ -186,6 +186,19 @@
 
 </div>
 
+<div id=bsodmom>
+<div id=bsod>
+  <p class=c><span>&nbsp;Progress Quest&nbsp;</span>
+  <p>&nbsp;
+  <p>An error has occurred.
+  <p>Error:
+  <p id=bsod_message>
+  <p>In <span id=bsod_source></span> at <span id=bsod_lineno></span>:<span id=bsod_colno></span>
+  <p id=bsod_error>
+  <p class=c>Press any key to continue...</p>
+</div>
+</div>
+
 <div id="paused"><br>PAUSED</div>
 
 </body>

main.js

@@ -1156,13 +1156,29 @@ function ToDna(s) {
   return r;
 }
 
+window.onerror = function(message, source, lineno, colno, error) {
+  $("#bsod_message").text(message);
+  $("#bsod_source").text(source);
+  $("#bsod_lineno").text(lineno);
+  $("#bsod_colno").text(colno);
+  $("#bsod_error").text(error.stack);
+
+  $("#bsodmom").show();
+};
+
 function FormKeyDown(e) {
+  $("#bsodmom").hide();
+
   var key = String.fromCharCode(e.which);
 
   if (key === 'd') {
     alert("Your character's genome is " + ToDna(game.dna + ""));
   }
 
+  // if (key === 'e') {
+  //   simulateanerror();
+  // }
+
   if (game.online) {
     if (key === 'b') {
       Brag('b', true);