diff --git a/Models/ThemeConfig/TagRenderingConfig.ts b/Models/ThemeConfig/TagRenderingConfig.ts
index bffe1e7f1f..1685344b10 100644
--- a/Models/ThemeConfig/TagRenderingConfig.ts
+++ b/Models/ThemeConfig/TagRenderingConfig.ts
@@ -14,8 +14,6 @@ import List from "../../UI/Base/List";
 import {MappingConfigJson, QuestionableTagRenderingConfigJson} from "./Json/QuestionableTagRenderingConfigJson";
 import {FixedUiElement} from "../../UI/Base/FixedUiElement";
 import {Paragraph} from "../../UI/Base/Paragraph";
-import spec = Mocha.reporters.spec;
-import SpecialVisualizations from "../../UI/SpecialVisualizations";
 
 export interface Mapping {
     readonly if: TagsFilter,
diff --git a/UI/Base/ChartJs.ts b/UI/Base/ChartJs.ts
index a4250f4c43..0389ee754c 100644
--- a/UI/Base/ChartJs.ts
+++ b/UI/Base/ChartJs.ts
@@ -1,6 +1,6 @@
 import BaseUIElement from "../BaseUIElement";
 import {Chart, ChartConfiguration, ChartType, DefaultDataPoint, registerables} from 'chart.js';
-Chart.register(...registerables);
+Chart?.register(...(registerables ?? []));
 
 
 export default class ChartJs<