Constant Crash back to MC Launcher Screen

Tessellating Block is part 1 of the error, but in 2 different places after a few moments on the server at that location caused game client to crash back to Launcher screen and is happening to a few diff users on my server. I myself was in Creative, but was also happening in same location for a user in Survival

http://pastebin.com/pt2nVGNz - Both crash reports listed in there