diff --git a/content/media/test/crashtests/920987.html b/content/media/test/crashtests/920987.html
new file mode 100644
index 000000000000..6e8b2992a65e
--- /dev/null
+++ b/content/media/test/crashtests/920987.html
@@ -0,0 +1,6 @@
+<script>
+var ctx = new AudioContext();
+var buffer = ctx.createBuffer(1, 1000, ctx.sampleRate);
+var array = new Float32Array(900);
+buffer.copyToChannel(array, 0, 0xfffffff8);
+</script>
diff --git a/content/media/test/crashtests/crashtests.list b/content/media/test/crashtests/crashtests.list
index 72ae0f29764e..4d1acbc64848 100644
--- a/content/media/test/crashtests/crashtests.list
+++ b/content/media/test/crashtests/crashtests.list
@@ -56,5 +56,6 @@ load 907986-2.html
 load 907986-3.html
 load 907986-4.html
 load 910171-1.html
+load 920987.html
 skip-if(B2G) load oscillator-ended-1.html # intermittent B2G timeouts, bug 920338
 skip-if(B2G) load oscillator-ended-2.html # intermittent B2G timeouts, bug 920338