[explorer] Typing custom URL crashes the explorer

[awelc]

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Steps to Reproduce Issue

Start typing "http" in the "Choose a Network"->"Custom RPC URL" field (you can still paste the full address and it will work, but when you start typing it, it will not). It was reported on Discord and confirmed by @longbowlu and myself.

Expected Result

Connect explorer to custom RPC server.

Actual Result

Explorer UI crashes

System Information

Tested on a Mac in Chrome

[awelc]

@Jordan-Mysten, this is still a problem. Could you please look into it?