diff --git a/src/ByteBeatNode.js b/src/ByteBeatNode.js
index 8790ca7..3325ff8 100644
--- a/src/ByteBeatNode.js
+++ b/src/ByteBeatNode.js
@@ -53,7 +53,9 @@ class BeatWorkletProcessor extends AudioWorkletProcessor {
   }
 
   process(inputs, outputs, parameters) {
-    this.byteBeat.process(outputs[0][0].length, outputs[0][0], outputs[0][1]);
+    if (outputs.length > 0) {
+      this.byteBeat.process(outputs[0][0].length, outputs[0][0], outputs[0][1]);
+    }
     return true;
   }
 }