#0  0x00007fe7dc01cf77 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
  [Error: ../nptl/sysdeps/unix/sysv/linux/raise.c was not found in source tree]
#1  0x00007fe7dc0205e8 in __GI_abort () at abort.c:90
  [Error: abort.c was not found in source tree]
#2  0x00007fe7dca3cf6d in _g_log_abort () at /build/buildd/glib2.0-2.37.6/./glib/gmessages.c:255
  [Error: /build/buildd/glib2.0-2.37.6/./glib/gmessages.c was not found in source tree]
#3  0x00007fe7dca5a537 in g_assertion_message (domain=domain@entry=0x7fe7de5c6843 <sparql_append_string_literal+403> "", file=file@entry=0x7fe7de67b688 <builtin_icons+420800> "\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\257\377\377\377", line=line@entry=1960, func=func@entry=0x7fe7de67bef0 <builtin_icons+422952> "\211\215\213\377\341\344\336\377\340\343\336\377\340\343\335\377\337\342\334\377\336\341\333\377\335\340\332\377\334\337\331\377\377\377\377\377\210\212\205\377\377\377\377", message=message@entry=0x299a9e0 "assertion failed: (retval != NULL)") at /build/buildd/glib2.0-2.37.6/./glib/gtestutils.c:2278
  [Error: /build/buildd/glib2.0-2.37.6/./glib/gtestutils.c was not found in source tree]
#4  0x00007fe7dca5a59a in g_assertion_message_expr (domain=0x7fe7de5c6843 <sparql_append_string_literal+403> "", file=0x7fe7de67b688 <builtin_icons+420800> "\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\377\227\230\225\257\377\377\377", line=1960, func=0x7fe7de67bef0 <builtin_icons+422952> "\211\215\213\377\341\344\336\377\340\343\336\377\340\343\335\377\337\342\334\377\336\341\333\377\335\340\332\377\334\337\331\377\377\377\377\377\210\212\205\377\377\377\377", expr=<optimized out>) at /build/buildd/glib2.0-2.37.6/./glib/gtestutils.c:2293
  [Error: /build/buildd/glib2.0-2.37.6/./glib/gtestutils.c was not found in source tree]
#5  0x00007fe7de48ac4e in ?? () at /build/buildd/gtk+3.0-3.8.4/./gtk/gtkmnemonichash.c:179 from /tmp/apport_sandbox_tInUg8/usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#6  0x000000000261af20 in ?? ()
#7  0x0000000000000000 in ?? ()