_2.contains is not a function after migration from 4.1 to 5.1

[stefan_berger]

Entire log from the Developer Console:

11:07:16.422:WARN:Log:Specified ID: FooterDSFooterView collides with the ID for an existing SmartGWT component or object. The existing object will be destroyed and the ID bound to the new object.
11:07:32.103:KPR6:WARN:Log:TypeError: _2.contains is not a function
Stack from error.stack:
    Canvas._performActionOnValue() @ residentialmedication/sc/modules/ISC_Core.js:3139
    Canvas._getFieldValue() @ residentialmedication/sc/modules/ISC_Core.js:3160
    ListGrid._getEditValue() @ residentialmedication/sc/modules/ISC_Grids.js:2065
    ListGrid.dataChanged() @ residentialmedication/sc/modules/ISC_Grids.js:1063
    Class.invokeSuper() @ residentialmedication/sc/modules/ISC_Core.js:270
    Class.Super() @ residentialmedication/sc/modules/ISC_Core.js:262
    TreeGrid.dataChanged() @ residentialmedication/sc/modules/ISC_Grids.js:2986
    ListGrid._observeData/<() @ residentialmedication/sc/modules/ISC_Grids.js:1027
    observation() @ residentialmedication/sc/modules/ISC_Core.js:310
    ListGrid._saveLocally() @ residentialmedication/sc/modules/ISC_Grids.js:2240
    ListGrid.saveEditedValues() @ residentialmedication/sc/modules/ISC_Grids.js:2232
    ListGrid.saveEdits() @ residentialmedication/sc/modules/ISC_Grids.js:2209
    ListGrid._saveAndHideEditor() @ residentialmedication/sc/modules/ISC_Grids.js:2164
    ListGrid.cellEditEnd() @ residentialmedication/sc/modules/ISC_Grids.js:2128
    ListGrid.editorKeyPress() @ residentialmedication/sc/modules/ISC_Grids.js:897
    isc.A.editFormDefaults.itemKeyPress() @ residentialmedication/sc/modules/ISC_Grids.js:859
    FormItem._fireKeyPressHandlers() @ residentialmedication/sc/modules/ISC_Forms.js:1230
    FormItem.handleKeyPress() @ residentialmedication/sc/modules/ISC_Forms.js:1222
    Class.invokeSuper() @ residentialmedication/sc/modules/ISC_Core.js:270
    Class.Super() @ residentialmedication/sc/modules/ISC_Core.js:262
    TextItem.handleKeyPress() @ residentialmedication/sc/modules/ISC_Forms.js:1628
    [c]EventHandler.bubbleEvent() @ residentialmedication/sc/modules/ISC_Core.js:1631
    [c]EventHandler.handleKeyPress() @ residentialmedication/sc/modules/ISC_Core.js:1405
    EventHandler._handleNativeKeyPress() @ residentialmedication/sc/modules/ISC_Core.js:1402
    [c]EventHandler.dispatch() @ residentialmedication/sc/modules/ISC_Core.js:1709
    anonymous() @ residentialmedication/sc/modules/ISC_Core.js:55

11:07:32.103:KPR6:WARN:Log:Uncaught JavaScript exception: TypeError: _2.contains is not a function in http://localhost:9580/eMedicClient/residentialmedication/sc/modules/ISC_Core.js, line 3139
11:18:45.678:WARN:Log:Uncaught JavaScript exception: uncaught exception: ReferenceError: isc is not defined in , line 0

Do you have any idea how I can find out where the problem lies?

The application is running with the nightly build from the 12th of July.

[Isomorphic]

In this thread, someone has reported a similar problem which we believe is due to using a specific field name in a ListGridRecord while not declaring it as an official ListGrid field. Are you using any ListGridRecord fields without declaring them as official ListGrid fields.