diff --git a/addons/web_editor/static/src/js/wysiwyg/widgets/color_palette.js b/addons/web_editor/static/src/js/wysiwyg/widgets/color_palette.js
index c5dd0fd7c25..dcce62f367a 100644
--- a/addons/web_editor/static/src/js/wysiwyg/widgets/color_palette.js
+++ b/addons/web_editor/static/src/js/wysiwyg/widgets/color_palette.js
@@ -38,7 +38,6 @@ const ColorPaletteWidget = Widget.extend({
      */
     init: function (parent, options) {
         this._super.apply(this, arguments);
-        this.customColorsArray = [].concat(...customColors);
         this.style = window.getComputedStyle(document.documentElement);
         this.options = _.extend({
             selectedColor: false,
@@ -254,9 +253,7 @@ const ColorPaletteWidget = Widget.extend({
             return;
         }
         this.el.querySelectorAll('.o_custom_color').forEach(el => el.remove());
-        const existingColors = new Set(this.customColorsArray.concat(
-            Object.keys(this.colorToColorNames)
-        ));
+        const existingColors = new Set(Object.keys(this.colorToColorNames));
         this.trigger_up('get_custom_colors', {
             onSuccess: (colors) => {
                 colors.forEach(color => {