diff --git a/src/js/audio.js b/src/js/audio.js
index 53b1850b..e0e81ccf 100644
--- a/src/js/audio.js
+++ b/src/js/audio.js
@@ -121,6 +121,7 @@ class Audio {
         panning = 0;
       }
     } else if (constants.chartType == 'heat') {
+      if (!plot.data || !plot.data[position.y]) return;
       rawFreq = plot.data[position.y][position.x];
       rawPanning = position.x;
       frequency = this.SlideBetween(
diff --git a/src/js/controls.js b/src/js/controls.js
index 9152bfe9..243cf141 100644
--- a/src/js/controls.js
+++ b/src/js/controls.js
@@ -569,6 +569,10 @@ class Control {
 
         constants.autoplayId = setInterval(function () {
           position.x += step;
+          if (!plot || !plot.plotData) {
+            constants.KillAutoplay();
+            return;
+          }
           if (position.x < 0 || plot.plotData.length - 1 < position.x) {
             constants.KillAutoplay();
             lockPosition();
@@ -1724,6 +1728,7 @@ class Control {
         }
 
         constants.autoplayId = setInterval(function () {
+          if (!plot) return;
           if (
             dir == 'left' ||
             dir == 'right' ||
@@ -2499,6 +2504,10 @@ class Control {
 
         constants.autoplayId = setInterval(function () {
           position.x += step;
+          if (!plot || !plot.plotData) {
+            constants.KillAutoplay();
+            return;
+          }
           if (position.x < 0 || plot.plotData.length - 1 < position.x) {
             constants.KillAutoplay();
             lockPosition();
@@ -2872,6 +2881,10 @@ class Control {
             dir == 'reverse-right'
           ) {
             position.x += step;
+            if (!plot || !plot.plotData) {
+              constants.KillAutoplay();
+              return;
+            }
             if (position.x < 0 || plot.plotData.length - 1 < position.x) {
               constants.KillAutoplay();
               lockPosition();
diff --git a/src/js/heatmap.js b/src/js/heatmap.js
index ec00fc99..65f71272 100644
--- a/src/js/heatmap.js
+++ b/src/js/heatmap.js
@@ -389,7 +389,7 @@ class HeatMapRect {
     var rect = document.createElementNS(svgns, 'rect');
     rect.setAttribute('id', 'highlight_rect');
     rect.setAttribute('x', this.x);
-    rect.setAttribute('y', this.y);
+    rect.setAttribute('y', this.y === undefined ? 0 : this.y);
     rect.setAttribute('width', this.width);
     rect.setAttribute('height', this.height);
     rect.setAttribute('stroke', constants.colorSelected);
diff --git a/src/js/scatterplot.js b/src/js/scatterplot.js
index b2b01526..0fe53ec6 100644
--- a/src/js/scatterplot.js
+++ b/src/js/scatterplot.js
@@ -462,6 +462,10 @@ class ScatterPlot {
       constants.sepPlayId = setInterval(
         function () {
           // play this tone
+          if (!audio || !audio.playTone) {
+            clearInterval(constants.sepPlayId);
+            return;
+          }
           audio.playTone();
 
           // and then set up for the next one
@@ -477,6 +481,10 @@ class ScatterPlot {
       ); // play all tones at the same time
     } else if (constants.chartType == 'smooth') {
       // best fit smooth layer
+      if (!audio || !audio.playTone) {
+        clearInterval(constants.sepPlayId);
+        return;
+      }
       audio.playTone();
     }
   }
@@ -520,7 +528,7 @@ class ScatterPlot {
       if (elIndex > -1) {
         data = singleMaidr.data[elIndex];
       } else {
-        data = singleMaidr.data
+        data = singleMaidr.data;
       }
       if (xyFormat == 'object') {
         for (let i = 0; i < data.length; i++) {
@@ -714,7 +722,9 @@ class Layer0Point {
           plot.plotPoints[this.circleIndex[i]] instanceof SVGUseElement ||
           plot.plotPoints[this.circleIndex[i]] instanceof SVGCircleElement
         ) {
-          y = plot.plotPoints[this.circleIndex[i]].getAttribute(plot.prefix + 'y');
+          y = plot.plotPoints[this.circleIndex[i]].getAttribute(
+            plot.prefix + 'y'
+          );
         }
 
         point.setAttribute('cy', y);