Bug#498154: wesnoth: Assertion `res.second' failed.

[Dmitry V. Rutsky]

Package: wesnoth
Version: 1:1.4.5-1
Severity: normal

It dies when I load the attached save and hit 'End Turn' with the following console output:
====
rutsky at balto:~$ wesnoth
Battle for Wesnoth v1.4.5
Started on Sun Sep  7 20:14:29 2008

Checking video mode: 2560x1600x32...
setting mode to 2560x1600x32
set locale to ''
set locale to ''
loadscreen: filesystem counter = 114
loadscreen: binarywml counter = 32480
loadscreen: setconfig counter = 44
loadscreen: parser counter = 244
loadscreen: filesystem counter = 0
loadscreen: binarywml counter = 16835
loadscreen: setconfig counter = 0
loadscreen: parser counter = 4
scenario: '3_Wasteland'
next_scenario: ''
wesnoth: unit_map.cpp:61: void unit_map::add(std::pair<gamemap::location, unit>*): Assertion `res.second' failed.
Aborted
====

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.24.2 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages wesnoth depends on:
ii  libboost-iostreams1.34 1.34.1-11         Boost.Iostreams Library
ii  libc6                  2.7-13            GNU C Library: Shared libraries
ii  libfreetype6           2.3.7-2           FreeType 2 font engine, shared lib
ii  libfribidi0            0.10.9-1          Free Implementation of the Unicode
ii  libgcc1                1:4.3.1-9         GCC support library
ii  libsdl-image1.2        1.2.6-3           image loading library for Simple D
ii  libsdl-mixer1.2        1.2.8-4           mixer library for Simple DirectMed
ii  libsdl-net1.2          1.2.7-2           network library for Simple DirectM
ii  libsdl1.2debian        1.2.13-2          Simple DirectMedia Layer
ii  libstdc++6             4.3.1-9           The GNU Standard C++ Library v3
ii  libx11-6               2:1.1.4-2         X11 client-side library
ii  python2.5              2.5.2-11          An interactive high-level object-o
ii  wesnoth-data           1:1.4.5-1         data files for Wesnoth
ii  zlib1g                 1:1.2.3.3.dfsg-12 compression library - runtime

Versions of packages wesnoth recommends:
ii  wesnoth-httt                  1:1.4.5-1  Heir to the Throne official campai
ii  wesnoth-tsg                   1:1.4.5-1  The South Guard official campaign 
ii  wesnoth-ttb                   1:1.4.5-1  A Tale of Two Brothers official ca

Versions of packages wesnoth suggests:
ii  wesnoth-all                   1:1.4.5-1  fantasy turn-based strategy game -

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