If you search for someone's posts and put a space in your query, the pagination links return zero results.
Test searches:
user:scawen (fine)
Page 2 (fine)
user:scawen test (fine)
Page 2 (no results)
Test searches:
user:scawen (fine)
Page 2 (fine)
user:scawen test (fine)
Page 2 (no results)