I pressed F3+H to reload all chunks and then I pressed escape to pause the game and it immediately crashed after pressing escape.

Full log: https://dl.dropboxusercontent.com/u/92370990/MC/fml-client-latest-5.log
Chrash report: https://dl.dropboxusercontent.com/u/92370990/MC/crash-2017-02-25_22.25.31-client.txt
Screenshot of the block that was crashing: http://i.imgur.com/SdZjY9u.png
FTB forum post: https://forum.feed-the-beast.com/threads/strange-crash.219175/

For now the fix is "don't do that with the debug screen up" as the crash has to do with our profiler hooks (which don't activate unless F3) is up. I will investigate the cause, though.

Fixed via Chisel-Team/ConnectedTexturesMod@6a773cf