IPOPT segfaults with a small sparse optimization problem

[ewu63]

Description

Steps to reproduce issue

1. Change self.N to 5000 in test_large_sparse.py
2. Run the IPOPT test

Current behavior

Optimization segfaults

Expected behavior

Optimization should complete successfully.

Code versions

List versions only if relevant

• IPOPT 3.13.2

[ewu63]

After #425 I am no longer able to reproduce this issue, closing.