segfault

[_LOG_LEVEL_DEBUG 08:54:29.417854] SearchManager.vala:215: Replace "private" with "public"
[_LOG_LEVEL_INFO 08:54:29.446488] SearchManager.vala:173: 13 occurrences found
[_LOG_LEVEL_DEBUG 08:54:29.851415] SearchManager.vala:215: Replace "private" with "public"
[_LOG_LEVEL_INFO 08:54:29.869035] SearchManager.vala:173: 12 occurrences found
[_LOG_LEVEL_INFO 08:54:30.392455] SearchManager.vala:173: 0 occurrences found
[_LOG_LEVEL_FATAL 08:54:30.611825] [GLib-GObject] g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[_LOG_LEVEL_FATAL 08:54:30.611909] Scratch will not function properly.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5b18297 in g_slice_alloc () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) bt
#0  0x00007ffff5b18297 in g_slice_alloc () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ffff5b1876e in g_slice_alloc0 () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff604bdb2 in g_type_create_instance () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3  0x00007ffff6030355 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#4  0x00007ffff60324c4 in g_object_new_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#5  0x00007ffff60328a4 in g_object_new () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007ffff4c73d2c in gdk_pixbuf_new_from_data () from /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0
#7  0x00007ffff6c5b928 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#8  0x00007ffff6c5c3aa in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#9  0x00007ffff6c60667 in gtk_icon_info_load_symbolic_for_context () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#10 0x00007ffff6c59e25 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#11 0x00007ffff6c5a096 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#12 0x00007ffff6c1594a in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#13 0x00007ffff6c1a86d in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#14 0x00007ffff6d110b0 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#15 0x00007ffff6d11373 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#16 0x00007ffff6d11475 in gtk_widget_get_preferred_width () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#17 0x00007ffff6d110b0 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
---Type <return> to continue, or q <return> to quit---
#18 0x00007ffff6d11373 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#19 0x00007ffff6d11518 in gtk_widget_get_preferred_width_for_height () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#20 0x00007ffff6d117f6 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#21 0x00007ffff6d6e4f7 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#22 0x00007ffff6d6ec59 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#23 0x00007ffff6d6ee89 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#24 0x00007ffff6d111ac in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#25 0x00007ffff6d11373 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#26 0x00007ffff6d109b8 in gtk_widget_get_preferred_height () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#27 0x00007ffff6ba8013 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#28 0x00007ffff6cf8ea1 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#29 0x00007ffff6d111ac in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#30 0x00007ffff6d11373 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#31 0x00007ffff6d116a8 in gtk_widget_get_preferred_height_and_baseline_for_width ()
   from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#32 0x00007ffff6bac889 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#33 0x00007ffff6d11166 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#34 0x00007ffff6d11373 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0