Assert location fails / Cannot read properties of null (reading publicKey)

[SebasFoo]

Describe the bug
Initial updating the assert location for a data-only hotspot fails.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Hotspot detail'
2. Click on 'Manage'
3. Click on 'Assert Location'
4. Select hotspot position in map
5. Click on 'Assert Location'
6. Click on 'IoT'
7. Click on 'Assert Location'
8. Confirm transaction fees

The I get the message in red: Update metadata request failed: Cannot read properties of null (reading 'publicKey')

Expected behavior
A updated / set location of the Helium hotspot

Screenshots
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Smartphone (please complete the following information):

• Device: iPhone SE2
• OS: iOS 17.2.1
• App v2.6.0

Additional context
Add any other context about the problem here.