nic-6443 opened a new issue #855:
URL: https://github.com/apache/apisix-ingress-controller/issues/855
### Issue description
APISIX Ingress Controller will panic while handle ingress delete event,
panic log:
```
2022-01-03T13:26:58Z debug ingress/ingress.go:346 ingress delete event
arrived {"final state": {}}
2022-01-03T13:26:58Z debug ingress/ingress.go:138 translated ingress
resource to a couple of routes, upstreams and pluginConfigs {"ingress": {},
"routes": [{"id":"46b67ef7","name":"ingress_httpbin.org_/ip","desc":"Created by
apisix-ingress-controller, DO NOT modify it
manually","labels":{"managed-by":"apisix-ingress-controller"},"host":"httpbin.org","uris":["/ip"],"upstream_id":"3d913da8"}],
"upstreams":
[{"id":"3d913da8","name":"ingress-apisix-e2e-tests-default-41670000_httpbin-service-e2e-test_80","desc":"Created
by apisix-ingress-controller, DO NOT modify it
manually","labels":{"managed-by":"apisix-ingress-controller"},"type":"roundrobin","nodes":[{"host":"172.30.45.175","port":80,"weight":100}],"scheme":"http"}],
"ssl": null, "pluginConfigs": null}
2022-01-03T13:26:58Z debug apisix/route.go:180 try to delete route
{"id": "46b67ef7", "name": "ingress_httpbin.org_/ip", "cluster": "default",
"url": "http://apisix-service-e2e-test:9180/apisix/admin/routes"}
2022-01-03T13:26:58Z debug apisix/upstream.go:171 try to delete upstream
{"id": "3d913da8", "name":
"ingress-apisix-e2e-tests-default-41670000_httpbin-service-e2e-test_80",
"cluster": "default", "url":
"http://apisix-service-e2e-test:9180/apisix/admin/upstreams"}
2022-01-03T13:26:58Z warn ingress/ingress.go:231 sync ingress failed,
will retry {"object":
{"Type":3,"Object":{"Key":"ingress-apisix-e2e-tests-default-41670000/ingress-v1-lb","GroupVersion":"networking/v1","OldObject":null},"Tombstone":{}},
"error": "ingress.networking.k8s.io \"ingress-v1-lb\" not found"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x161d20a]
goroutine 297 [running]:
github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).handleSyncErr(0xc0000cdae0,
{0x16c6e40, 0xc000246ae0}, {0x0, 0x0})
/Users/nic/GolandProjects/apisix-ingress-controller/pkg/ingress/ingress.go:237
+0x82a
github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).runWorker(0xc0000cdae0,
{0x1cb2430, 0xc000244280})
/Users/nic/GolandProjects/apisix-ingress-controller/pkg/ingress/ingress.go:81
+0x92
created by
github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).run
/Users/nic/GolandProjects/apisix-ingress-controller/pkg/ingress/ingress.go:68
+0x253
```
### Environment
use code in master branch
### Minimal test code / Steps to reproduce
/
### Actual result
/
### Error log
/
### Expected result
_No response_
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