[bisq-network/bisq] error when trying to buy an offer (#5655)

[Scoop193]

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### Description

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#### Version

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### Steps to reproduce

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### Expected behaviour

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### Actual behaviour

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#### Device or machine

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windows 10 HP


#### Additional info

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![2021-08-06](https://user-images.githubusercontent.com/77167690/128555744-703a5188-f450-4e6b-b158-b13c9992baa6.png)
![2021-08-06 (1)](https://user-images.githubusercontent.com/77167690/128555778-5bb7a68e-decd-4151-9d77-1bc19bc0f6a5.png)
![2021-08-06 (2)](https://user-images.githubusercontent.com/77167690/128555794-45fd863b-6dba-4ff0-8dc4-c85a93a142b4.png)


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