**System Information**
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11
**Blender Version**
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-24 18:24, hash: `rB3e75f70acd7d`
Worked: (newest version of Blender that worked as expected)
**Short description of error**
Was working to create a "Sierpinski Sponge" which uses iterative geometry nodes. I set up a level 1 sponge, but when I went to duplicate the geo node modifier, Blender crashes.
**Exact steps for others to reproduce the error**
The following simplified steps still causes Blender to crash:
1) Create geometry node for default cube
2) Add "Instance on Points" node
3) Create a new cube.
4) Add "Object Info" for the new cube, then attach "Geometry" node output to "Instance" node input of Instance on Points node
5) In Modifiers tab, for Geo Node modifier, click drop down and select "Duplicate"
Blender crashes.