fix: 报错问题

server-service/src/main/java/com/makeit/service/platform/elder/impl/PlatElderServiceImpl.java

@@ -906,6 +906,10 @@ public class PlatElderServiceImpl extends ServiceImpl<PlatElderMapper, PlatElder
     public List<PlatDevice> getFallDevice(String id) {
         PlatElder platElder = getById(id);
 
+        if (platElder == null) {
+            return null;
+        }
+
         if (StringUtils.isBlank(platElder.getBedId())) {
             return null;
         }