diff --git a/apps/health/ChangeLog b/apps/health/ChangeLog
index 74be2faec..62d93e606 100644
--- a/apps/health/ChangeLog
+++ b/apps/health/ChangeLog
@@ -13,3 +13,4 @@
 0.12: Add setting for Daily Step Goal
 0.13: Add support for internationalization
 0.14: Move settings
+0.15: Fix charts (fix #1366)
diff --git a/apps/health/app.js b/apps/health/app.js
index a1fe1a4f7..c0a40bd93 100644
--- a/apps/health/app.js
+++ b/apps/health/app.js
@@ -46,7 +46,7 @@ function menuHRM() {
 
 function stepsPerHour() {
   E.showMessage(/*LANG*/"Loading...");
-  let data = new Uint16Array(24);
+  var data = new Uint16Array(24);
   require("health").readDay(new Date(), h=>data[h.hr]+=h.steps);
   g.clear(1);
   Bangle.drawWidgets();
@@ -57,7 +57,7 @@ function stepsPerHour() {
 
 function stepsPerDay() {
   E.showMessage(/*LANG*/"Loading...");
-  let data = new Uint16Array(31);
+  var data = new Uint16Array(31);
   require("health").readDailySummaries(new Date(), h=>data[h.day]+=h.steps);
   g.clear(1);
   Bangle.drawWidgets();
@@ -68,8 +68,8 @@ function stepsPerDay() {
 
 function hrmPerHour() {
   E.showMessage(/*LANG*/"Loading...");
-  let data = new Uint16Array(24);
-  let cnt = new Uint8Array(23);
+  var data = new Uint16Array(24);
+  var cnt = new Uint8Array(23);
   require("health").readDay(new Date(), h=>{
     data[h.hr]+=h.bpm;
     if (h.bpm) cnt[h.hr]++;
@@ -84,8 +84,8 @@ function hrmPerHour() {
 
 function hrmPerDay() {
   E.showMessage(/*LANG*/"Loading...");
-  let data = new Uint16Array(31);
-  let cnt = new Uint8Array(31);
+  var data = new Uint16Array(31);
+  var cnt = new Uint8Array(31);
   require("health").readDailySummaries(new Date(), h=>{
     data[h.day]+=h.bpm;
     if (h.bpm) cnt[h.day]++;
@@ -100,7 +100,7 @@ function hrmPerDay() {
 
 function movementPerHour() {
   E.showMessage(/*LANG*/"Loading...");
-  let data = new Uint16Array(24);
+  var data = new Uint16Array(24);
   require("health").readDay(new Date(), h=>data[h.hr]+=h.movement);
   g.clear(1);
   Bangle.drawWidgets();
@@ -111,7 +111,7 @@ function movementPerHour() {
 
 function movementPerDay() {
   E.showMessage(/*LANG*/"Loading...");
-  let data = new Uint16Array(31);
+  var data = new Uint16Array(31);
   require("health").readDailySummaries(new Date(), h=>data[h.day]+=h.movement);
   g.clear(1);
   Bangle.drawWidgets();
@@ -183,7 +183,7 @@ function drawBarChart() {
     }
 
     // draw a fake 0 height bar if chart_index is outside the bounds of the array
-    if ((chart_index + bar - 1) >= 0 && (chart_index + bar - 1) < data_len)
+    if ((chart_index + bar - 1) >= 0 && (chart_index + bar - 1) < data_len && chart_max_datum > 0)
       bar_top = bar_bot - 100 * (chart_data[chart_index + bar - 1]) / chart_max_datum;
     else
       bar_top = bar_bot;
diff --git a/apps/health/metadata.json b/apps/health/metadata.json
index 58762c77a..a038f67b5 100644
--- a/apps/health/metadata.json
+++ b/apps/health/metadata.json
@@ -1,7 +1,7 @@
 {
   "id": "health",
   "name": "Health Tracking",
-  "version": "0.14",
+  "version": "0.15",
   "description": "Logs health data and provides an app to view it",
   "icon": "app.png",
   "tags": "tool,system,health",