Segfault when using view priority history

[vidarsk]

Tested on latest git-version compiled with tiles on linux and a 100% clean latest windows stable tiles download. Steps to reproduce:
Start a new game.
Drop an item.
Press 'V', '+', and then the up arrow key.
Game crashes.

[kevingranade]

Reproduced on linux, tiles-only. I think BevapDin fixed the curses fersion but not the tiles version. Here's a backtrace:
#0 0x083d67b8 in werase(WINDOW_) ()
#1 0x0824fc6c in uimenu::~uimenu() ()
#2 0x080f8b53 in string_input_win(WINDOW_, std::string, int, int, int, int, bool, long&, int&, std::string, int, int, bool, bool) ()
#3 0x080fcbff in string_input_popup(std::string, int, std::string, std::string, std::string, int, bool) ()
#4 0x0834bd8c in game::ask_item_priority_high(WINDOW*, int) ()
#5 0x083803c4 in game::list_items(int) ()
#6 0x083a6a0c in game::handle_action() ()
#7 0x083a919c in game::do_turn() ()
#8 0x08050f82 in main ()