Slot skill v 11.9.0

I have a bot that is working fine in version 11.8.4, but after migrating to version 11.9.0.
I faced the below exception in slot_fill action for time slot.

2019-05-19T07:42:14.610Z bp:dialog (tasheel-platinum-bot-en) [8l27i1m63m0uw09uymbnlqjqr4l5l] execute action "basic-skills/slot_fill"
07:42:14.642 ActionService An error occurred while executing the action "basic-skills/slot_fill [TypeError, Cannot read property 'split' of undefined]
STACK TRACE
TypeError: Cannot read property 'split' of undefined
    at slotFill (vm.js:11:33)
    at Object.<anonymous> (vm.js:52:8)
    at NodeVM.run (/snapshot/build-linux/node_modules/vm2/lib/main.js:428:23)
    at runInVm.Promise (/snapshot/build-linux/out/bp/core/services/action/vm.js:0:0)
    at Promise._execute (/home/administrator/botpress11.9.0/modules/.cache/module__d8dc4180421a1d3d5072b92ca5191a7a330631199a7899167734f363086b75f0/node_production_modules/bluebird/js/release/debuggability.js:313:9)
    at Promise._resolveFromExecutor (/home/administrator/botpress11.9.0/modules/.cache/module__d8dc4180421a1d3d5072b92ca5191a7a330631199a7899167734f363086b75f0/node_production_modules/bluebird/js/release/promise.js:483:18)
    at new Promise (/home/administrator/botpress11.9.0/modules/.cache/module__d8dc4180421a1d3d5072b92ca5191a7a330631199a7899167734f363086b75f0/node_production_modules/bluebird/js/release/promise.js:79:10)
    at VmRunner.runInVm (/snapshot/build-linux/out/bp/core/services/action/vm.js:0:0)
    at ScopedActionService.<anonymous> (/snapshot/build-linux/out/bp/core/services/action/action-service.js:0:0)
    at Generator.next (<anonymous>)
07:42:14.644 DialogEngine Error processing "basic-skills/slot_fill {"slotName":"appointmentTime","entity":"undefined"}"
                          Err: An error occurred while executing the action "basic-skills/slot_fill"
                          Flow: skills/Slot-f16e8b.flow.json
                          Node: slot-extract

the event details

{
   "type":"text",
   "channel":"web",
   "direction":"incoming",
   "payload":{
      "type":"text",
      "text":"9 pm"
   },
   "target":"8l27i1m63m0uw09uymbnlqjqr4l5l",
   "botId":"tasheel-platinum-bot-en",
   "createdOn":"2019-05-19T07:42:13.215Z",
   "threadId":"2",
   "id":"155825173321521540",
   "preview":"9 pm",
   "flags":{

   },
   "state":{
      "user":{
         "accountId":"701",
         "first_name":"Abdelaziz",
         "last_name":"Abdelghani",
         "language":"en",
         "languageId":"1",
         "timezone":-4
      },
      "context":{
         "currentFlow":"skills/Slot-f16e8b.flow.json",
         "currentNode":"slot-extract",
         "previousFlow":"book_appointment_flow.flow.json",
         "previousNode":"prompt_time_node",
         "jumpPoints":[
            {
               "flow":"main.flow.json",
               "node":"entry"
            },
            {
               "flow":"book_appointment_flow.flow.json",
               "node":"prompt_time_node"
            }
         ],
         "queue":{
            "instructions":[
               {
                  "type":"on-receive",
                  "fn":"basic-skills/slot_fill {\"slotName\":\"appointmentTime\",\"entity\":\"undefined\"}"
               },
               {
                  "type":"transition",
                  "fn":"session.extractedSlots.appointmentTime && (temp.valid === undefined || temp.valid == \"true\")",
                  "node":"extracted"
               },
               {
                  "type":"transition",
                  "fn":"true",
                  "node":"not-extracted"
               }
            ]
         }
      },
      "session":{
         "lastMessages":[
            {
               "eventId":"155825170724340500",
               "incomingPreview":"book appointment tomorrow 9 pm",
               "replyConfidence":1,
               "replySource":"dialogManager",
               "replyDate":"2019-05-19T07:41:49.012Z",
               "replyPreview":"#!builtin_text-d-3n-5"
            },
            {
               "eventId":"155825170724340500",
               "incomingPreview":"book appointment tomorrow 9 pm",
               "replyConfidence":1,
               "replySource":"dialogManager",
               "replyDate":"2019-05-19T07:41:56.349Z",
               "replyPreview":"#!builtin_text-8A6-VU"
            },
            {
               "eventId":"155825172813970000",
               "incomingPreview":"book appointment tomorrow",
               "replyConfidence":1,
               "replySource":"dialogManager",
               "replyDate":"2019-05-19T07:42:09.426Z",
               "replyPreview":"#!builtin_text-npHX8R"
            }
         ],
         "extractedSlots":{
            "notFound":0,
            "appointmentType":{
               "name":"appointmentType",
               "value":"appointment",
               "entity":{
                  "name":"appointmentType",
                  "type":"list",
                  "meta":{
                     "confidence":1,
                     "provider":"native",
                     "source":"appointment",
                     "start":5,
                     "end":16,
                     "raw":{

                     }
                  },
                  "data":{
                     "extras":{
                        "occurence":"appointment"
                     },
                     "value":"appointment",
                     "unit":"string"
                  }
               },
               "timestamp":1558251729368,
               "turns":0,
               "overwritable":true,
               "expiresAfterTurns":false
            },
            "appointmentDate":{
               "name":"appointmentDate",
               "value":"2019-05-20T00:00:00.000+00:00",
               "entity":{
                  "name":"time",
                  "type":"system",
                  "meta":{
                     "confidence":1,
                     "provider":"native",
                     "source":"tomorrow",
                     "start":17,
                     "end":25,
                     "raw":{
                        "body":"tomorrow",
                        "start":17,
                        "value":{
                           "values":[
                              {
                                 "value":"2019-05-20T00:00:00.000+00:00",
                                 "grain":"day",
                                 "type":"value"
                              }
                           ],
                           "value":"2019-05-20T00:00:00.000+00:00",
                           "grain":"day",
                           "type":"value"
                        },
                        "end":25,
                        "dim":"time"
                     }
                  },
                  "data":{
                     "value":"2019-05-20T00:00:00.000+00:00",
                     "unit":"day",
                     "extras":[
                        {
                           "value":"2019-05-20T00:00:00.000+00:00",
                           "grain":"day",
                           "type":"value"
                        }
                     ]
                  }
               },
               "timestamp":1558251729368,
               "turns":0,
               "overwritable":true,
               "expiresAfterTurns":false
            }
         },
         "nluContexts":[
            {
               "context":"bookAppointment",
               "ttl":1000
            }
         ]
      },
      "temp":{
         "intentAppointmentDate":"2019-05-20T00:00:00.000+00:00 "
      }
   },
   "suggestions":[

   ],
   "nlu":{
      "entities":[
         {
            "name":"time",
            "type":"system",
            "meta":{
               "confidence":1,
               "provider":"native",
               "source":"9 pm",
               "start":0,
               "end":4,
               "raw":{
                  "body":"9 pm",
                  "start":0,
                  "value":{
                     "values":[
                        {
                           "value":"2019-05-19T21:00:00.000+00:00",
                           "grain":"hour",
                           "type":"value"
                        },
                        {
                           "value":"2019-05-20T21:00:00.000+00:00",
                           "grain":"hour",
                           "type":"value"
                        },
                        {
                           "value":"2019-05-21T21:00:00.000+00:00",
                           "grain":"hour",
                           "type":"value"
                        }
                     ],
                     "value":"2019-05-19T21:00:00.000+00:00",
                     "grain":"hour",
                     "type":"value"
                  },
                  "end":4,
                  "dim":"time"
               }
            },
            "data":{
               "value":"2019-05-19T21:00:00.000+00:00",
               "unit":"hour",
               "extras":[
                  {
                     "value":"2019-05-19T21:00:00.000+00:00",
                     "grain":"hour",
                     "type":"value"
                  },
                  {
                     "value":"2019-05-20T21:00:00.000+00:00",
                     "grain":"hour",
                     "type":"value"
                  },
                  {
                     "value":"2019-05-21T21:00:00.000+00:00",
                     "grain":"hour",
                     "type":"value"
                  }
               ]
            }
         }
      ],
      "language":"n/a",
      "slots":{
         "appointmentTime":{
            "name":"appointmentTime",
            "value":"2019-05-19T21:00:00.000+00:00",
            "entity":{
               "name":"time",
               "type":"system",
               "meta":{
                  "confidence":1,
                  "provider":"native",
                  "source":"9 pm",
                  "start":0,
                  "end":4,
                  "raw":{
                     "body":"9 pm",
                     "start":0,
                     "value":{
                        "values":[
                           {
                              "value":"2019-05-19T21:00:00.000+00:00",
                              "grain":"hour",
                              "type":"value"
                           },
                           {
                              "value":"2019-05-20T21:00:00.000+00:00",
                              "grain":"hour",
                              "type":"value"
                           },
                           {
                              "value":"2019-05-21T21:00:00.000+00:00",
                              "grain":"hour",
                              "type":"value"
                           }
                        ],
                        "value":"2019-05-19T21:00:00.000+00:00",
                        "grain":"hour",
                        "type":"value"
                     },
                     "end":4,
                     "dim":"time"
                  }
               },
               "data":{
                  "value":"2019-05-19T21:00:00.000+00:00",
                  "unit":"hour",
                  "extras":[
                     {
                        "value":"2019-05-19T21:00:00.000+00:00",
                        "grain":"hour",
                        "type":"value"
                     },
                     {
                        "value":"2019-05-20T21:00:00.000+00:00",
                        "grain":"hour",
                        "type":"value"
                     },
                     {
                        "value":"2019-05-21T21:00:00.000+00:00",
                        "grain":"hour",
                        "type":"value"
                     }
                  ]
               }
            },
            "source":"undefined pm"
         }
      },
      "intent":{
         "name":"book_appointment_date_intent",
         "confidence":1,
         "context":"bookAppointment"
      },
      "intents":[
         {
            "name":"book_appointment_date_intent",
            "confidence":1,
            "context":"bookAppointment"
         }
      ],
      "errored":false,
      "includedContexts":[
         "bookAppointment"
      ],
      "ms":1341
   }
}

Please advise.
Thanks

my issue resolved after removing the slot skills and create them again