Error when selecting user defined variability in pregnancy models

[PavelBal]

Open a PK-Sim project from the pregnancy-repository (e.g., "Acyclovir.pksim5").

Open a pregnant population, navigate to "User Defined Variability". Select any "Volume":

Application:
PK-Sim® 11.3.208

Object reference not set to an instance of an object.

Stack trace:

at PKSim.Presentation.Presenters.AdvancedParameters.AdvancedParametersPresenter.advancedParameterSelected(ParameterNodeSelectedEventArgs e)
   at PKSim.Presentation.Presenters.AdvancedParameters.AdvancedParametersPresenter.<.ctor>b__8_3(Object o, ParameterNodeSelectedEventArgs e)
   at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   at PKSim.Presentation.Presenters.Populations.PopulationParameterGroupsPresenter.NodeSelected(ITreeNode node)
   at PKSim.UI.Views.Populations.PopulationParameterGroupsView.<>c__DisplayClass9_0.<activateNode>b__0()
   at OSPSuite.UI.Controls.BaseUserControl.<>c__DisplayClass23_0.<OnEvent>b__0()
   at OSPSuite.Utility.Extensions.ExceptionExtensions.DoWithinExceptionHandler(Object callerObject, Action actionToExecute)