Avalon MM Master Template - Writing makes Nios2 crash

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But when I'm trying to loop write (in the VHDL) and read values using my Nios program, it keeps on crashing and I can't figure out why. I'm assuming that trying to perform a nios read access while writing in the SDRAM put me in this situation but I don't know how to protect this situation from occuring.

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I guess the VHDL loop write is blocking some bus signal and prevents Nios from accessing sdram,

whilst using the test switch the same condition is momentary and you don't experience the problem.