Comment 2 for bug 1561276

StacktraceTop:
 __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7f5ad42adfb8 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
 malloc_printerr (ar_ptr=<optimized out>, ptr=<optimized out>, str=0x7f5ad42aad94 "free(): invalid pointer", action=3) at malloc.c:5007
 _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3868
 __GI___libc_free (mem=<optimized out>) at malloc.c:2969
 g_hash_table_unref () from /tmp/apport_sandbox_n5lqNG/lib/x86_64-linux-gnu/libglib-2.0.so.0