[bisq-network/bisq] Getting java.lang.NumberFormatException and blank/unresponsive Bisq window (#5366)

[m52go]

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### Description

Since upgrading my Bisq instance to 1.5.9 about 10 days ago, I've gotten this error about 4-5 times:

`Mar-26 20:03:25.028 [JavaFX Application Thread] ERROR b.c.u.MathUtils: java.lang.NumberFormatException: Character I is neither a decimal digit number, decimal point, nor "e" notation exponential mark.`

When this happens, Bisq becomes unresponsive. Usually the Bisq window becomes a blank white rectangle, but sometimes the Bisq GUI remains visible (but not operational).

When this happens, I have to kill Bisq and then open it again -- closing Bisq properly doesn't work. So far there haven't been any errors opening properly afterward.

### Version

1.5.9

### Steps to reproduce

I got this error a couple of times last year, but then it went away with an update so I didn't report it.

But I also didn't report it because there's not very much help I can give on reproducing it......

The error seems to occur randomly, and when it occurs, all logs are overwritten so quickly that any clues of the bug's cause are quickly overwritten:

![bisq-error](https://user-images.githubusercontent.com/735155/112739079-bd454d00-8f60-11eb-8793-f1159f2a3153.gif)

Every time this error has happened so far, I wasn't actively using Bisq. Sometimes I was actively using the machine it was running on (but not using Bisq), and sometimes I wasn't using the machine at all (screen locked but machine still on).

If I don't catch the error quickly, computer fans go crazy until the Bisq program is killed (often, the next morning).

### Expected behaviour

N/A

### Actual behaviour

N/A

### Screenshots

See above GIF for an idea of what logs look like streaming in real-time.

As noted above, the Bisq window usually turns into a blank white rectangle.

#### Device or machine

Ubuntu 18.04

#### Additional info

Can provide logs upon request, but these logs will only show logs _after_ this error occurs.

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