[ADVISOR] advisor stop session fails (panic) with Error evaluating projection - cause: Panic: interface conversion: interface {} is []interface {}, not map[string]interface {}

cbq> SELECT ADVISOR({'action':'stop', 'session':'6e7fd7be-c4f2-4ab1-9ac3-3daa56563b5f'});

{

    "requestID": "e5e80a49-9d85-45cd-b9b9-fc75cf49bfb6",

    "signature": {

        "$1": "object"

    },

    "results": [

    ],

    "errors": [

        {

            "code": 5010,

            "msg": "Error evaluating projection - cause: Panic: interface conversion: interface {} is []interface {}, not map[string]interface {}"

        }

    ],

    "status": "errors",

    "metrics": {

        "elapsedTime": "44.944837ms",

        "executionTime": "44.879899ms",

        "resultCount": 0,

        "resultSize": 0,

        "serviceLoad": 6,

        "errorCount": 1

    }

} 

2021-08-31T19:03:09.490+00:00 [SEVERE] panic: interface conversion: interface {} is []interface {}, not map[string]interface {}

2021-08-31T19:03:09.491+00:00 [SEVERE] request text: <ud>DELETE from system:tasks_cache where class = "advisor"  and name = "6e7fd7be-c4f2-4ab1-9ac3-3daa56563b5f"</ud>

2021-08-31T19:03:09.491+00:00 [SEVERE] query context: <ud></ud>

2021-08-31T19:03:09.491+00:00 [SEVERE] stack: goroutine 8188 [running]:

github.com/couchbase/query/execution.(*Context).Recover(0xc00124e000, 0xc000aebb00)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/context.go:985 +0xc6

panic(0x2174e80, 0xc00127c4b0)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.16.6/go/src/runtime/panic.go:971 +0x499

github.com/couchbase/query/execution.(*base).close(0xc000aebb00, 0xc00124e000)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/base.go:273 +0x233

panic(0x2174e80, 0xc00127c4b0)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.16.6/go/src/runtime/panic.go:971 +0x499

github.com/couchbase/query/execution.(*base).notify(0xc000aebb00)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/base.go:988 +0x178

panic(0x2174e80, 0xc00127c4b0)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.16.6/go/src/runtime/panic.go:971 +0x499

github.com/couchbase/query/server.reportChangedValues(0xc001349508, 0xc0013494d8)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/server/set_params.go:347 +0x6ce

github.com/couchbase/query/server.ProcessSettings(0xc002173650, 0xc00016c000, 0x24436a6, 0xa)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/server/set_params.go:334 +0x9ac

github.com/couchbase/query/server/http.settingsWorkHorse(0xc002173650, 0xc00016c000, 0xc002148e68, 0x1)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/server/http/admin_clustering_endpoint.go:435 +0x9c

github.com/couchbase/query/server/http.(*systemRemoteHttp).Settings(0xc0004f4fc0, 0xc002173650, 0xc00035cf70, 0xc001349950)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/server/http/system_remote.go:746 +0x3a

github.com/couchbase/query/expression.(*Advisor).scheduleTask.func2(0x7f8ee05d9a28, 0xc00124ef00, 0x0, 0x0, 0x2088900, 0xc00186f400, 0xc0009c1a50, 0x24, 0xc00165cc30)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/expression/func_advisor.go:241 +0x62

github.com/couchbase/query/scheduler.DeleteTask(0xc00165cc30, 0x24, 0xe, 0xc0014d6701)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/scheduler/scheduler.go:219 +0x3ce

github.com/couchbase/query/datastore/system.(*tasksCacheKeyspace).Delete(0xc0001e6100, 0xc001330000, 0x1, 0x40, 0x26a6168, 0xc00124e000, 0x1, 0x6, 0xc0018bd410, 0xc000579bb0, ...)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/datastore/system/system_keyspace_tasks_cache.go:167 +0x165

github.com/couchbase/query/execution.(*SendDelete).flushBatch(0xc000aebb00, 0xc00124e000, 0xc00060fd00)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/delete_send.go:150 +0x3ab

github.com/couchbase/query/execution.(*SendDelete).afterItems(0xc000aebb00, 0xc00124e000)

        /home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/delete_send.go:106 +0x35

github.com/couchbase/query/execution.(*base).runConsumer.func1()

...