版本号：

问题描述：

给表框设置颜色边框，导出excel时控制台报错，设置背景颜色或者给单元格设置个数值类型的导出同样报错

截图&代码：

控制台报错信息：
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$EntryIterator.next(HashMap.java:1463)
at java.util.HashMap$EntryIterator.next(HashMap.java:1461)
at org.jeecg.modules.jmreport.desreport.render.a.b.a(TableDynamicRenderStrategy.java:586)
at org.jeecg.modules.jmreport.desreport.render.a.b.b(TableDynamicRenderStrategy.java:755)
at org.jeecg.modules.jmreport.desreport.render.a.b.render(TableDynamicRenderStrategy.java:860)
2021-07-13 14:12:20.188 [http-nio-8094-exec-6] ERROR o.a.c.c.C.[.[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException: null
at org.jeecg.modules.jmreport.desreport.service.a.k.a(JmReportExportExcelImpl.java:653)
at org.jeecg.modules.jmreport.desreport.service.a.k.a(JmReportExportExcelImpl.java:471)
at org.jeecg.modules.jmreport.desreport.service.a.k.a(JmReportExportExcelImpl.java:273)
at org.jeecg.modules.jmreport.desreport.service.a.k.exportExcel(JmReportExportExcelImpl.java:119)
at org.jeecg.modules.jmreport.desreport.a.a.a(DesignReportController.java:960)
at sun.reflect.GeneratedMethodAccessor350.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:798)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)

友情提示： 未按格式要求发帖，会直接删掉。