TySelect crash on 'additive selections with poly select' 0.16089

[AndyMurdock]

TySelect crashes when pressing Additive Selections on mesh that is a polymesh. 
Max 2021 TyFlow 0.16089
Steps to Repro
1. Crate plane obj segments 50 * 50
2. Apply TySelect 
3. Press Additive Selections 
4. Apply PolySelect before TySelect
Crash

See attached file


Andy