There have already been several shocks[1], and the world has been able to control it, so I do not expect a global economic crisis was leading to the collapse of the entire financial system.
A breakdown may occur for some individuals, banks, large corporations or even countries, so diversification of the economy is the only way to avoid bankruptcy.
Gold[2] and cryptocurrencies[3] considered as an alternative economic pattern of the current system, so if there is a global crisis will be offset by a wave of rising/falling of other systems.
So far cryptos have not gained sufficient confidence as a guarantor of value, so it is better to invest in gold.

[1] https://en.wikipedia.org/wiki/Financial_crisis
[2] Macro-factors on gold pricing during the financial crisis
[3] How Would a Financial Crisis Affect Cryptocurrencies?