My Blender model keeps crashing and I don't really know why when I render it get to between 80% and 95% on updating BVH and just flat out crashes. I am using cycles with 2.78c

Crash report-Cycles shader graph connect: can only connect closure to closure (Bump.Normal to Add Shader.Closure2). Cycles shader graph connect: can only connect closure to closure (Bump.Normal to Add Shader.Closure2). Malloc returns null: len=16 in Cycles Alloc, total 2348295728 Malloc returns null: len=8 in Cycles Alloc, total 2348295664 Malloc returns null: len=8 in Cycles Alloc, total 2348295672 Error: Unrecognized Exception Error: Unrecognized Exception

Anyone Got Any idea this is all I got from the command prompt thing.