diff --git a/04.系统编码/Frontend/src/uilts/box-drawer.ts b/04.系统编码/Frontend/src/uilts/box-drawer.ts
index 35798cd..e0cb0ec 100644
--- a/04.系统编码/Frontend/src/uilts/box-drawer.ts
+++ b/04.系统编码/Frontend/src/uilts/box-drawer.ts
@@ -1,3 +1,4 @@
+import { number } from "echarts";
 import moment from "moment";
 
 export function createEmptyCanvas(id: string, width: number, height: number): void{
@@ -398,7 +399,8 @@ export class ColorChart{
     }
 
     public getColor(value: number): string{
-        
+        if (isNaN(value)) return null;
+
         for(let index = 1; index < this.valueLength; index ++){
             if (this.values[index -1] < value && this.values[index] >= value){
                 return this.colors[index - 1];