diff --git a/src/controllers/analytic_controller.ts b/src/controllers/analytic_controller.ts
index e8400a4..6fca88d 100644
--- a/src/controllers/analytic_controller.ts
+++ b/src/controllers/analytic_controller.ts
@@ -171,6 +171,9 @@ export class AnalyticController {
   }
 
   onAnalyticUnitColorChange(id: AnalyticUnitId, value: string) {
+    if(id === undefined) {
+      throw new Error('id is undefined');
+    }
     this._analyticUnitsSet.byId(id).color = value;
   }