Game crash while loading world

Using some scoreboard blocks. And also using some command blocks.
And I got maybe also a cmd-redstoneblock clock, but I'm not sure.
The world is redstone flatland. If you want to I'll sent the world too to check it out.

And btw: this bug happens already in 1.7.2.
It could be that the newer MCL is the problem, not sure
Worked with the old launcher (1.3.4).