GDC fails about tkd HOT 5 OPEN

        foreach (tag; tags)
        {
            assert(!tag.all!(isNumber), "Tags must not be entirely composed of numbers.");
        }

(gdb) r
Starting program: /home/simendsjo/.dub/packages/tkd-master/build/example/example 
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff3c49700 (LWP 2840)]

Program received signal SIGSEGV, Segmentation fault.
0x000000000043a514 in std.utf.__T6decodeTAyaZ.decode() (str=..., 
    index=@0x7fffffffd8c8: 0) at /usr/include/dlang/gdc/std/utf.d:958
958     if (str[index] < codeUnitLimit!S)
(gdb) bt
#0  0x000000000043a514 in std.utf.__T6decodeTAyaZ.decode() (str=..., 
    index=@0x7fffffffd8c8: 0) at /usr/include/dlang/gdc/std/utf.d:958
#1  0x000000000043a467 in std.array.__T5frontTyaZ.front() (a=...)
    at /usr/include/dlang/gdc/std/array.d:647
#2  0x00000000004617bf in std.algorithm.__T4findS623std10functional40__T3notS29_D3std3uni8isNumberFNaNbNfwZbZ3notTAyaZ.find() (haystack=...)
    at /usr/include/dlang/gdc/std/algorithm.d:4299
#3  0x0000000000461756 in std.algorithm.__T3allS29_D3std3uni8isNumberFNaNbNfwZbTAyaZ.all() (range=...) at /usr/include/dlang/gdc/std/algorithm.d:10206
#4  0x00000000004b4f10 in tkd.widget.canvas.CanvasItem.__T7setTagsTC3tkd6widget6canvas10CanvasItemZ.setTags() (this=..., tags=...) at source/tkd/widget/canvas.d:713
#5  0x000000000041e647 in tkd.widget.canvas.CanvasItem.init() (this=..., parent=...)
    at source/tkd/widget/canvas.d:640
#6  0x00000000004222ac in tkd.widget.canvas.CanvasRectangle.init() (this=..., 
    parent=...) at source/tkd/widget/canvas.d:1251
#7  0x00000000004b01b8 in tkd.widget.canvas.Canvas.__T7addItemTC3tkd6widget6canvas6CanvasZ.addItem() (this=..., item=...) at source/tkd/widget/canvas.d:386
#8  0x000000000040c239 in main.Application.createCanvasPane() (this=...)
    at source/example/example.d:328
#9  0x000000000040d36a in main.Application.initInterface() (this=...)
    at source/example/example.d:454
#10 0x00000000004192e4 in tkd.tkdapplication.TkdApplication.__ctor() (this=...)
    at source/tkd/tkdapplication.d:102
#11 0x000000000040d8ba in main.Application.__ctor() (this=...)
    at source/example/example.d:13
#12 0x000000000040d8eb in D main (args=...) at source/example/example.d:495
#13 0x00000000004d127f in rt.dmain2._d_run_main() ()
#14 0x00000000004d174f in rt.dmain2._d_run_main() ()
#15 0x00000000004d1999 in rt.dmain2._d_run_main() ()
#16 0x00000000004d174f in rt.dmain2._d_run_main() ()
#17 0x00000000004d18c6 in _d_run_main ()
#18 0x00000000004071bb in main (argc=1, argv=0x7fffffffe418)
    at /usr/include/dlang/gdc/__entrypoint.di:59