diff --git a/web/js/components/image-download/image-download-panel.js b/web/js/components/image-download/image-download-panel.js
index f6475c86df..75b0f29a96 100644
--- a/web/js/components/image-download/image-download-panel.js
+++ b/web/js/components/image-download/image-download-panel.js
@@ -1,8 +1,8 @@
 import React, { useState, useEffect } from 'react';
 import { useSelector } from 'react-redux';
-import { getActivePalettes } from '../../modules/palettes/selectors';
 import PropTypes from 'prop-types';
 import googleTagManager from 'googleTagManager';
+import { getActivePalettes } from '../../modules/palettes/selectors';
 import {
   imageSizeValid,
   getDimensions,
diff --git a/web/js/containers/toolbar.js b/web/js/containers/toolbar.js
index f77f4d960d..f55953e5f2 100644
--- a/web/js/containers/toolbar.js
+++ b/web/js/containers/toolbar.js
@@ -21,7 +21,7 @@ import {
   requestNotifications,
   setNotifications,
 } from '../modules/notifications/actions';
-import { clearCustoms, refreshPalettes } from '../modules/palettes/actions';
+import { refreshPalettes } from '../modules/palettes/actions';
 import { clearRotate, refreshRotation } from '../modules/map/actions';
 import {
   showLayers, hideLayers,
diff --git a/web/js/modules/image-download/util.js b/web/js/modules/image-download/util.js
index 77b01ba722..14c143f076 100644
--- a/web/js/modules/image-download/util.js
+++ b/web/js/modules/image-download/util.js
@@ -1,5 +1,4 @@
 import {
-  each as lodashEach,
   get as lodashGet,
 } from 'lodash';
 import { transform } from 'ol/proj';
@@ -189,7 +188,7 @@ export function imageUtilGetLayers(products, proj, activePalettes) {
     } else if (layer.projections[proj].layer) {
       layerId = layer.projections[proj].layer;
     }
-    const disabled = activePalettes[layer.id]?.maps?.[0]?.disabled;
+    const disabled = activePalettes?.[layer.id]?.maps?.[0]?.disabled;
     if (Array.isArray(disabled)) {
       return `${layerId}(disabled=${disabled.join('-')})`;
     }
@@ -333,12 +332,14 @@ export function getDownloadUrl(url, proj, layerDefs, bbox, dimensions, dateTime,
     `BBOX=${bboxWMS13(bbox, crs)}`,
     `CRS=${crs}`,
     `LAYERS=${layersArray.join(',')}`,
-    `colormaps=${colormaps.join(',')}`,
     `WRAP=${layerWraps.join(',')}`,
     `FORMAT=${imgFormat}`,
     `WIDTH=${width}`,
     `HEIGHT=${height}`,
   ];
+  if (Array.isArray(colormaps) && colormaps.length > 0) {
+    params.push(`colormaps=${colormaps.join(',')}`);
+  }
   if (granuleDates.length > 0) {
     params.push(`granule_dates=${granuleDates}`);
   }
diff --git a/web/js/modules/image-download/util.test.js b/web/js/modules/image-download/util.test.js
index f791c7a497..e422b96b96 100644
--- a/web/js/modules/image-download/util.test.js
+++ b/web/js/modules/image-download/util.test.js
@@ -218,7 +218,7 @@ test('Download URL [imagedownload-url]', () => {
     { id: 1, longitude: 2.7117, latitude: -19.1609 },
     { id: 2, longitude: 71.173, latitude: -39.0961 },
   ];
-  const dlURL = getDownloadUrl(url, proj, mockLayerDefs, lonlats, dimensions, dateTime, false, false, locationMarkers);
+  const dlURL = getDownloadUrl(url, proj, mockLayerDefs, lonlats, dimensions, dateTime, false, false, locationMarkers, undefined);
   const expectedURL = 'http://localhost:3002/api/v1/snapshot'
     + '?REQUEST=GetSnapshot'
     + '&TIME=2019-06-24T00:00:00Z'
@@ -228,6 +228,7 @@ test('Download URL [imagedownload-url]', () => {
     + '&WRAP=day'
     + '&FORMAT=image/jpeg'
     + '&WIDTH=300&HEIGHT=300'
+    + '&colormaps='
     + '&MARKER=2.7117,-19.1609,71.173,-39.0961';
   expect(dlURL.includes(expectedURL)).toBe(true);
 });