修复:避免错误

src/DatabaseServices/Template/TemplateRecord.ts

@@ -141,8 +141,11 @@ export class TemplateRecord extends SymbolTableRecord
         callback(this);
         for (let c of this.Children)
         {
-            let template = c.Object as TemplateRecord;
-            template.Traverse(callback);
+            if (c && c.Object)
+            {
+                let template = c.Object as TemplateRecord;
+                template.Traverse(callback);
+            }
         }
     }
     async TraverseAsync(callback: (arg0: this) => Promise<void>)