This is the query recorded in the db.system.profile when Wekan failed

wekan_failed-mongo-query.json

{
        "op" : "query",
        "ns" : "wekan.cfs_gridfs._tempstore.files",
        "query" : {
                "find" : "cfs_gridfs._tempstore.files",
                "filter" : {
                        "_id" : ObjectId("59e09b5417f17cce18db73e2")
                },
                "ntoreturn" : -1
        },
        "keysExamined" : 0,
        "docsExamined" : 0,
        "idhack" : true,
        "cursorExhausted" : true,
        "keyUpdates" : 0,
        "writeConflicts" : 0,
        "numYield" : 0,
        "locks" : {
                "Global" : {
                        "acquireCount" : {
                                "r" : NumberLong(2)
                        }
                },
                "Database" : {
                        "acquireCount" : {
                                "r" : NumberLong(1)
                        }
                },
                "Collection" : {
                        "acquireCount" : {
                                "r" : NumberLong(1)
                        }
                }
        },
        "nreturned" : 0,
        "responseLength" : 20,
        "millis" : 0,
        "execStats" : {
                "stage" : "IDHACK",
                "nReturned" : 0,
                "executionTimeMillisEstimate" : 0,
                "works" : 1,
                "advanced" : 0,
                "needTime" : 0,
                "needYield" : 0,
                "saveState" : 0,
                "restoreState" : 0,
                "isEOF" : 1,
                "invalidates" : 0,
                "keysExamined" : 0,
                "docsExamined" : 0
        },
        "ts" : ISODate("2017-10-13T10:54:12.203Z"),
        "client" : "10.121.199.8",
        "allUsers" : [ ],
        "user" : ""
}