update

edu-user/edu-user-server/src/main/java/com/keao/edu/user/controller/AppVersionInfoController.java

@@ -39,7 +39,7 @@ public class AppVersionInfoController extends BaseController {
 	@GetMapping(value = "/queryByPlatform")
 	public Object queryByPlatform(String platform) {
 		List<AppVersionInfo> list = appVersionInfoService.queryNewestByPlatform(platform);
-		if (list.size() > 0) {
+		if (list != null && list.size() > 0) {
 			return succeed(list.get(0));
 		}
 		return failed();