fix error with accessing undefined array

Author: Sidsector9

dist/component/CharacterMap.js

@@ -188,7 +188,7 @@ var CharacterMap = function (_React$Component) {
                  * that character from secondary and replace the least used character
                  * from primary with it.
                  */
-                if (this.secondaryPaletteCache[0].count > this.paletteCache[paletteMaxSize - 1].count) {
+                if (this.paletteCache[paletteMaxSize - 1] && this.secondaryPaletteCache[0].count > this.paletteCache[paletteMaxSize - 1].count) {
                     var maxCountCharInSecondaryPalette = this.secondaryPaletteCache.shift();
                     this.paletteCache[paletteMaxSize - 1] = maxCountCharInSecondaryPalette;
                     this.paletteCache.sort(function (a, b) {

src/component/CharacterMap.js

@@ -129,7 +129,7 @@ class CharacterMap extends React.Component {
              * that character from secondary and replace the least used character
              * from primary with it.
              */
-            if (this.secondaryPaletteCache[0].count > this.paletteCache[paletteMaxSize - 1].count) {
+            if (this.paletteCache[paletteMaxSize - 1] && this.secondaryPaletteCache[0].count > this.paletteCache[paletteMaxSize - 1].count) {
                 const maxCountCharInSecondaryPalette = this.secondaryPaletteCache.shift();
                 this.paletteCache[paletteMaxSize - 1] = maxCountCharInSecondaryPalette;
                 this.paletteCache.sort( ( a, b ) => b.count - a.count );