...

examcloud-core-basic-service/src/main/java/cn/com/qmth/examcloud/core/basic/service/impl/StudentServiceImpl.java

@@ -175,6 +175,9 @@ public class StudentServiceImpl implements StudentService {
 			}
 
 			for (String studentCode : studentCodeList) {
+				if (StringUtils.isBlank(studentCode)) {
+					continue;
+				}
 				StudentCodeEntity studentCodeEntity = studentCodeRepo
 						.findByStudentCodeAndRootOrgId(studentCode, rootOrgId);