diff --git a/package.json b/package.json
index 99a672e636..e362adbfe3 100644
--- a/package.json
+++ b/package.json
@@ -150,6 +150,7 @@
 		"loader-utils": "1.1.0",
 		"lodash.assign": "4.2.0",
 		"mecab-async": "0.1.2",
+		"merge-options": "1.0.1",
 		"minio": "7.0.0",
 		"mkdirp": "0.5.1",
 		"mocha": "5.2.0",
diff --git a/src/client/app/desktop/views/pages/admin/admin.chart.chart.ts b/src/client/app/desktop/views/pages/admin/admin.chart.chart.ts
index d79b0ba192..c09dc6dd8c 100644
--- a/src/client/app/desktop/views/pages/admin/admin.chart.chart.ts
+++ b/src/client/app/desktop/views/pages/admin/admin.chart.chart.ts
@@ -1,5 +1,6 @@
 import Vue from 'vue';
 import { Line } from 'vue-chartjs';
+import * as mergeOptions from 'merge-options';
 
 export default Vue.extend({
 	extends: Line,
@@ -21,7 +22,7 @@ export default Vue.extend({
 	},
 	methods: {
 		render() {
-			this.renderChart(this.data, Object.assign({
+			this.renderChart(this.data, mergeOptions({
 				responsive: false,
 				scales: {
 					xAxes: [{