fix: mint form lockperiod throws js error when network slow

[newbreedofgeek]

Description

Check all boxes that apply and review your code if you can't tick them all yet:

• [ ] Did you test your changes in logged out, mainnet logged in and devnet logged in modes?
• [ ] Did you test your changes in mobile, tablet and desktop modes?
• [ ] Did you test your changes with or without the Itheum Web2 API availability? (don't forget about "graceful fallback")
• [ ] Did you use good user alerts and error messages? (and put them in language.ts)
• [ ] Did you leave the code base cleaner than you found it overall (done reasonable refactoring efforts wherever you felt that was needed)?

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