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@@ -27,6 +27,7 @@ import org.springframework.stereotype.Service;
 import java.rmi.ServerException;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 
 /**
@@ -136,49 +137,69 @@ public class CourseServiceImpl implements ICourseService {
         for (CourseVo vo : list) {
             if(StrUtil.isNotBlank(vo.getTwoDimensionalOssId())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getTwoDimensionalOssId()));
+                if(Objects.nonNull(oss)) {
                     vo.setTwoDimensionalOssUrl(oss.getUrl());
                 }
+            }
             if(StrUtil.isNotBlank(vo.getTwoDimensionalUrl())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getTwoDimensionalUrl()));
+                if(Objects.nonNull(oss)) {
                     vo.setTwoDimensionalUrl(oss.getUrl());
                 }
+            }
             if(StrUtil.isNotBlank(vo.getTwoDimensionalType())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getTwoDimensionalType()));
+                if(Objects.nonNull(oss)) {
                     vo.setTwoDimensionalType(oss.getUrl());
                 }
+            }
             if(StrUtil.isNotBlank(vo.getThreeDimensionalOssId())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getThreeDimensionalOssId()));
+                if(Objects.nonNull(oss)) {
                     vo.setThreeDimensionalOssUrl(oss.getUrl());
                 }
+            }
             if(StrUtil.isNotBlank(vo.getThreeDimensionalUrl())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getThreeDimensionalUrl()));
+                if(Objects.nonNull(oss)) {
                     vo.setThreeDimensionalUrl(oss.getUrl());
                 }
+            }
             if(StrUtil.isNotBlank(vo.getThreeDimensionalType())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getThreeDimensionalType()));
+                if(Objects.nonNull(oss)) {
                     vo.setThreeDimensionalType(oss.getUrl());
                 }
+            }
             if(StrUtil.isNotBlank(vo.getCaseOssId())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getCaseOssId()));
+                if(Objects.nonNull(oss)) {
                     vo.setCaseOssUrl(oss.getUrl());
                     vo.setCaseFileVoList(ossUrlService.selectFileVoByIds(vo.getCaseOssId()));
                 }
+            }
             if(StrUtil.isNotBlank(vo.getTeachingOssId())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getTeachingOssId()));
+                if(Objects.nonNull(oss)) {
                     vo.setTeachingOssUrl(oss.getUrl());
                     vo.setTeachingFileVoList(ossUrlService.selectFileVoByIds(vo.getTeachingOssId()));
                 }
+            }
             if(StrUtil.isNotBlank(vo.getPptOssId())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getPptOssId()));
+                if(Objects.nonNull(oss)) {
                     vo.setPptOssUrl(oss.getUrl());
                     vo.setPptFileVoList(ossUrlService.selectFileVoByIds(vo.getPptOssId()));
                 }
+            }
 
             if(StrUtil.isNotBlank(vo.getOssId())){
                 SysOssVo oss = iSysOssService.getById(Long.valueOf(vo.getOssId()));
+                if(Objects.nonNull(oss)) {
                     vo.setOssUrl(oss.getUrl());
                 }
             }
+        }
         return list;
     }