[Freeciv-Dev] (PR#14553) /endgame crashes the client

["Per I. Mathisen" <per@xxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=14553 >

To reproduce: Start server, connect client, start game, /endgame

Encodings: Data=UTF-8, Local=UTF-8, Internal=UTF-8
civclient: messagewin_common.c:54: meswin_thaw: Assertion `frozen_level >= 0' 
failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread -1208219168 (LWP 15352)]
0x00fc1402 in __kernel_vsyscall ()
(gdb) bt
#0  0x00fc1402 in __kernel_vsyscall ()
#1  0x00b73118 in raise () from /lib/libc.so.6
#2  0x00b74888 in abort () from /lib/libc.so.6
#3  0x00b6c2f5 in __assert_fail () from /lib/libc.so.6
#4  0x0806ca18 in meswin_thaw () at messagewin_common.c:54
#5  0x0805ab4d in reports_thaw () at climisc.c:967
#6  0x0807028d in handle_thaw_hint () at packhand.c:2720
#7  0x08073ae6 in client_handle_packet (type=PACKET_THAW_HINT, packet=0x9623a10)
    at packhand_gen.c:35
#8  0x08057e07 in handle_packet_input (packet=0x9623a10, type=3) at 
civclient.c:390
#9  0x0805c298 in input_from_server (fd=9) at clinet.c:349
#10 0x00496800 in gdk_get_show_events () from /usr/lib/libgdk-x11-2.0.so.0
#11 0x001ea4fc in g_vasprintf () from /usr/lib/libglib-2.0.so.0
#12 0x001c44ce in g_main_context_dispatch () from
/usr/lib/libglib-2.0.so.0
#13 0x001c74d6 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#14 0x001c77c3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#15 0x03879a46 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#16 0x080f92cf in ui_main (argc=1, argv=0xbfddbbf4) at gui_main.c:1241
#17 0x08058927 in main (argc=1, argv=0xbfddbbf4) at civclient.c:351