Bug report: Crash on adding dive

[Henrik Brautaset Aronsen]

1) Open Subsurface
2) Open or Import test1.xml
3) Add dive
4) Select OK twice
5) Boom boom boom:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libgtk-quartz-2.0.0.dylib         0x000000010faa52a7 
gtk_tree_model_get_valist + 407
1   libgtk-quartz-2.0.0.dylib         0x000000010faa50ef 
gtk_tree_model_get + 319
2   org.hohndel.subsurface            0x000000010f5ff37a 
merge_dive_into_trip_above_cb + 426 (divelist.c:1410)
3   org.hohndel.subsurface            0x000000010f5fe206 fill_dive_list 
+ 2198 (divelist.c:1117)
4   org.hohndel.subsurface            0x000000010f5fe3a7 
dive_list_update_dives + 71 (divelist.c:1144)
5   org.hohndel.subsurface            0x000000010f5ea1ee report_dives + 
638 (main.c:149)
6   org.hohndel.subsurface            0x000000010f5fe704 add_dive_cb + 
68 (divelist.c:1246)
7   libgobject-2.0.0.dylib            0x000000011024f104 
g_closure_invoke + 308
8   libgobject-2.0.0.dylib            0x000000011025e859 
signal_emit_unlocked_R + 1641

Henrik