Lilac harvesting crashes game - possible duplication bug!

Game crashed while harvesting lilacs.

What I expected to happen was...:
For the game to continue working properly!

What actually happened was...:
The game crashed unexpectedly.

Steps to Reproduce:
1. Find lilacs.
2. Break lilacs with fist/tool/torch.
3. As they collect in your inventory, game eventually crashes.
4. Possible duplication exploit.