Aias00 opened a new issue, #6706:
URL: https://github.com/apache/shenyu/issues/6706

   - severity: Medium
   - files: 
`shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/InstanceCheckService.java:145-167,
 206-211, 213-243`
   - description: `instance.getInstanceState()` is an `Integer`. `doCheck` uses 
`InstanceStatusEnum.ONLINE.getCode() == instance.getInstanceState()` — when 
`getCode()` is `int`, the `Integer` is unboxed; if `instanceState` is null this 
is an NPE. `collectStateData` (208) and `getInstanceDataVisual` (219) also use 
`Collectors.groupingBy(InstanceInfoVO::getInstanceState, ...)` which throws NPE 
on null keys.
   - impact: A single instance with null state crashes the scheduled `doCheck` 
(caught and logged, so all instance state tracking silently stalls for that 
cycle).
   - suggested_fix: Normalize null state to a default code when loading; guard 
unboxing with explicit null checks.
   - confidence: Medium
   - related_existing: none.
   
   ---
   _Identified during the 2026-08-02 deep re-scan; full list in 
[`docs/scan2-2026-08-02/06-medium-tiers.md`](docs/scan2-2026-08-02/06-medium-tiers.md)._


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