The editor crashes when trying to add an animation key frame for the row fill setting for a grid panel

Steps to Reproduce
  1. Open the editor
  2. Create a new widget blueprint
  3. Add a Grid panel to the designer tab
  4. Create a new widget animation
  5. Add an element to the row fill for the grid panel
  6. Set the row fill to 1 (important, does not appear to crash when set to 0)
  7. Click the add key frame button next to the row fill

Result: The editor will crash
Expected: A key from would be set for the row fill option

Community References

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ComponentUE - Editor - UI Systems
Affects Versions4.
Target Fix4.23
Fix Commit6912778
Main Commit6912778
CreatedJun 7, 2019
ResolvedJun 10, 2019
UpdatedFeb 6, 2020
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