From 00fb644f8a8abe1fa66bc3c16a63bd237071fdfe Mon Sep 17 00:00:00 2001
From: monitor1394 <monitor1394@gmail.com>
Date: Thu, 17 Feb 2022 08:39:55 +0800
Subject: [PATCH] Fixed MissingReferenceException #183

---
 Runtime/Helper/CheckHelper.cs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Runtime/Helper/CheckHelper.cs b/Runtime/Helper/CheckHelper.cs
index d579f67f..f9cb20dd 100644
--- a/Runtime/Helper/CheckHelper.cs
+++ b/Runtime/Helper/CheckHelper.cs
@@ -18,12 +18,18 @@ namespace XCharts
 
         public static string CheckChart(BaseGraph chart)
         {
-            if (chart is BaseChart) return CheckChart((BaseChart)chart);
-            else return string.Empty;
+            if(chart == null)
+                return string.Empty;
+            if (chart is BaseChart)
+                return CheckChart((BaseChart)chart);
+            else
+                return string.Empty;
         }
 
         public static string CheckChart(BaseChart chart)
         {
+            if(chart == null)
+                return string.Empty;
             var sb = ChartHelper.sb;
             sb.Length = 0;
             CheckName(chart, sb);