dotnetnuke - Dnn Remove Razor Host module from tab programmatically doesn't delete it properly -


i have razor script running in razor module, _bootstrapper.cshtml, responsible generating bunch of pages , adding modules them. when it's done there's button remove razor host module (_bootstrapper.cshtml) page.

the code follows: 

public void removebootstrapper(int portalid, int pageid) {     list<moduleinfo> listofmodules = getpagerazorhostmodules(portalid, pageid);      foreach (moduleinfo module in listofmodules)     {         foreach (var settingkey in module.modulesettings.keys)         {             if (settingkey.tostring().tolower() == "scriptfile")             {                 if (module.modulesettings[settingkey].tostring().tolower() == "_bootstrapper.cshtml")                 {                     deletemodulefrompage(pageid, module.moduleid, false);                 }             }         }     } }  public void deletemodulefrompage(int pageid, int moduleid, bool softdelete) {     modulecontroller modulecontroller = new modulecontroller();     modulecontroller.deletetabmodule(pageid, moduleid, softdelete); }

a couple of notes:

  1. when call removebootstrapper executes without exception
  2. after calling removebootstrapper page reloads, razor host module still on page, nothing rendered, it's blank
  3. trying access properties on blank razor host module results in exceptions, e.g. settings,
  4. trying use module context menu remove module throws exceptions

here few exceptions i'm seeing logged:

  • 2017-07-28 08:39:31,198 [win-dsk-2][thread:6][error] dotnetnuke.services.exceptions.exceptions - system.nullreferenceexception: object reference not set instance of object. @ dotnetnuke.modules.admin.modules.modulesettingspage.oninit(eventargs e)
  • 2017-07-28 08:39:31,233 [win-dsk-2][thread:6][error] dotnetnuke.services.exceptions.exceptions - dotnetnuke.services.exceptions.moduleloadexception: niet afgehandelde fout bij toevoegen module aan contentpane ---> system.nullreferenceexception: object reference not set instance of object. @ dotnetnuke.modules.admin.modules.modulesettingspage.oninit(eventargs e)
  • 2017-07-28 08:39:31,341 [win-dsk-2][thread:6][error] dotnetnuke.services.exceptions.exceptions - friendlymessage="fout: op dit moment niet beschikbaar." ctrl="asp.admin_modules_modulesettings_ascx" exc="system.nullreferenceexception: object reference not set instance of object. @ dotnetnuke.security.permissions.permissionprovider.candeletemodule(moduleinfo module)
  • 2017-07-28 08:39:31,653 [win-dsk-2][thread:6][error] dotnetnuke.services.exceptions.exceptions - friendlymessage="er een fout opgetreden." ctrl="asp.admin_menus_moduleactions_moduleactions_ascx" exc="system.nullreferenceexception: object reference not set instance of object. @ dotnetnuke.ui.containers.actionbase.get_actionroot()
  • 2017-07-28 08:39:31,662 [win-dsk-2][thread:6][fatal] dotnetnuke.framework.pagebase - error has occurred while loading page. system.nullreferenceexception: object reference not set instance of object. @ dotnetnuke.modules.admin.modules.modulesettingspage.oninit(eventargs e)
  • 2017-07-28 08:39:31,668 [win-dsk-2][thread:6][error] dotnetnuke.services.exceptions.exceptions - ~/default.aspx?tabid=1819&error=object+reference+not+set+to+an+instance+of+an+object. system.nullreferenceexception: object reference not set instance of object. @ dotnetnuke.modules.admin.modules.modulesettingspage.oninit(eventargs e)

edit 1:
troubleshooting step revealed odd.
click remove, page reloads , shows blank razor host module causes problems. reset iis, refresh page , blank razor host module gone. tried number of times , it's consistent. i'm assuming might related in-memory cache then, why? i've never seen behavior before. page cache set 'not specified'.

edit 2:
can reproduce behavior in edit 1 clicking clear cache in dnn


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