Turnip prophet prediction error

[dozetal]

Things to check

• Have you forced a refresh in your browser (e.g. ctrl+F5 in Chrome/Firefox)?
  • yes/no
• Have you made sure the first time buyer option is correct? If you're unsure, try it both ways
  • yes/no
• Have you time-travelled this week? Travelling backwards resets the prices, and therefore you must not put prices in from both before & after the time-travel
  • yes/no

Describe the bug
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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

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Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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