** CRITICAL **: vala_ccode_function_add_declaration: assertion `self != NULL' failed

#0  0x00007ffff6a48ba5 in raise () from /lib/libc.so.6
#1  0x00007ffff6a4c6b0 in abort () from /lib/libc.so.6
#2  0x00007ffff6ffff0a in g_logv () from /lib/libglib-2.0.so.0
#3  0x00007ffff6ffffa3 in g_log () from /lib/libglib-2.0.so.0
#4  0x00007ffff7950e4e in vala_ccode_base_module_emit_temp_var (
    self=<value optimized out>, local=<value optimized out>)
    at valaccodebasemodule.c:13043
#5  0x00007ffff796dd43 in vala_ccode_base_module_real_visit_object_creation_expression (base=0x630210, expr=<value optimized out>)
    at valaccodebasemodule.c:17513
#6  0x00007ffff7ad2ac0 in vala_object_creation_expression_real_emit (
    base=0x3537500, codegen=0x630210) at valaobjectcreationexpression.c:2702
#7  0x00007ffff796efda in vala_ccode_base_module_real_visit_field (
    base=0x630210, f=0x2da4240) at valaccodebasemodule.c:3521
#8  0x00007ffff7a3ea0f in vala_class_real_accept_children (base=0x2d65090,
    visitor=0x630210) at valaclass.c:1774
#9  0x00007ffff7a21db2 in vala_gtype_module_real_visit_class (base=0x630210,
    cl=0x2d65090) at valagtypemodule.c:2970
#10 0x00007ffff7a0e744 in vala_gobject_module_real_visit_class (
    base=<value optimized out>, cl=0x2d65090) at valagobjectmodule.c:523
#11 0x00007ffff7b1c219 in vala_source_file_accept_children (
    self=<value optimized out>, visitor=0x630210) at valasourcefile.c:429
#12 0x00007ffff794bd76 in vala_ccode_base_module_real_visit_source_file (
    base=0x630210, source_file=0x63d0a0) at valaccodebasemodule.c:1891
#13 0x00007ffff794d7f5 in vala_ccode_base_module_real_emit (base=0x630210,
    context=0x619000) at valaccodebasemodule.c:1341
#14 0x0000000000405481 in vala_compiler_run (self=0x615000)
    at valacompiler.c:993
#15 0x0000000000405ff4 in vala_compiler_main (argc=<value optimized out>,
    argv=<value optimized out>) at valacompiler.c:1629
#16 main (argc=<value optimized out>, argv=<value optimized out>)
    at valacompiler.c:1638