diff --git a/snap.html b/snap.html
index 027cbbfb..8e6cc053 100755
--- a/snap.html
+++ b/snap.html
@@ -10,7 +10,7 @@
         <script type="text/javascript" src="src/blocks.js?version=2020-05-25"></script>
         <script type="text/javascript" src="src/threads.js?version=2020-05-24"></script>
         <script type="text/javascript" src="src/objects.js?version=2020-05-18"></script>
-        <script type="text/javascript" src="src/gui.js?version=2020-05-22"></script>
+        <script type="text/javascript" src="src/gui.js?version=2020-05-26"></script>
         <script type="text/javascript" src="src/paint.js?version=2020-05-17"></script>
         <script type="text/javascript" src="src/lists.js?version=2020-05-18"></script>
         <script type="text/javascript" src="src/byob.js?version=2020-05-17"></script>
diff --git a/src/gui.js b/src/gui.js
index 14e74711..f072a7a2 100644
--- a/src/gui.js
+++ b/src/gui.js
@@ -78,7 +78,7 @@ Animation, BoxMorph, BlockEditorMorph, BlockDialogMorph, Note*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2020-May-22';
+modules.gui = '2020-May-26';
 
 // Declarations
 
@@ -9950,7 +9950,7 @@ SoundRecorderDialogMorph.prototype.ok = function () {
 SoundRecorderDialogMorph.prototype.destroy = function () {
     this.stop();
     this.audioElement.remove();
-    if (this.mediaRecorder) {
+    if (this.mediaRecorder && this.mediaRecorder.stream) {
         this.mediaRecorder.stream.getTracks()[0].stop();
     }
     SoundRecorderDialogMorph.uber.destroy.call(this);