Game crashed after modifying RT_COMMAND_BUF to 3 !

According to the comment in code in file platform.h, we can modify RT_COMMAND_BUF_COUNT from 2 to 3 to increasing render thread. But after setting to 3, and rebuild, the game crashed once running. Doesn’t this Macro work?

When we render a scene with much many objects in our PC, both the CPU and the GPU utilization percent is not high. So we have tried to change the Macro “RT_COMMAND_BUF” in engine code to use more CPU, but it can’t work, fail to run after building. Do you have some suggestions for this?