pianoid excessive WARN logging

I've peeked at the source code and don't understand what this log message is warning about. In any case, it's filling my log file (it is constantly writing the warning). Is there something I can fix in my setup? If not, can you disable this warning in the next version?

...
[75.432 warn src/pianoid.cpp:562 draw_white_keys] WTF
[75.490 warn src/pianoid.cpp:562 draw_white_keys] WTF
[75.592 warn src/pianoid.cpp:562 draw_white_keys] WTF
[75.692 warn src/pianoid.cpp:562 draw_white_keys] WTF
[75.789 warn src/pianoid.cpp:562 draw_white_keys] WTF
[75.890 warn src/pianoid.cpp:562 draw_white_keys] WTF
[75.992 warn src/pianoid.cpp:562 draw_white_keys] WTF
...