When using ModifyDefinition to update a mate in an assembly, when I use the ModifyDefinition for a second time it causes solidworks to crash when i come to close the assembly that the macro ran on.

This is how I am using the ModifyDefinition:-

Dim swAssembly As SldWorks.AssemblyDoc

Set swAssembly = swModel

Set swFeat = swModel.FirstFeature
    While Not swFeat Is Nothing
       
'If swFeat.Name = "CylFreeStroke"