diff --git a/src/plugins/utils.js b/src/plugins/utils.js
index 86346d3..bdc8646 100644
--- a/src/plugins/utils.js
+++ b/src/plugins/utils.js
@@ -502,13 +502,16 @@ class Util {
     }
 
     generateWaveform(data, messageContent) {
+        if (!(window.AudioContext || window.webkitAudioContext)) {
+            return; // No support
+        }
         const audioCtx = new (window.AudioContext || window.webkitAudioContext)();
         if (audioCtx) {
             return audioCtx.decodeAudioData(data)
                 .then((audioBuffer) => {
-                    const rawData = audioBuffer.getChannelData(0); // We only need to work with one channel of data
-                    const samples = 1000; // Number of samples we want to have in our final data set
-                    const blockSize = Math.floor(rawData.length / samples); // the number of samples in each subdivision
+                    const rawData = audioBuffer.getChannelData(0); // TODO - currently using only 1 channel
+                    const samples = 1000; // Number of samples
+                    const blockSize = Math.floor(rawData.length / samples);
                     let filteredData = [];
                     for (let i = 0; i < samples; i++) {
                       let blockStart = blockSize * i; // the location of the first sample in the block