A sim disappeared in the Sims4 (household and familty tree)

Product: The Sims 4
Platform:PC
Which language are you playing the game in? Português
How often does the bug occur? Rarely (0% - 9%)
What is your current game version number? 1.107.112.1030 DX9
What expansions, game packs, and stuff packs do you have installed? Tiny Living StrangerVille Seasons Romantic Garden Stuff Parenthood Paranormal Stuff My First Pet Stuff High School Years Growing Together Get to Work Get Famous Desert Luxe Kit Cottage Living City Living Cats and Dogs Backyard Stuff
Steps: How can we find the bug ourselves? Once the household is open, a sim is not displayed, not even in the family tree.
What happens when the bug occurs? A sim disappeared of the household.
What do you expect to see? The missing sim.
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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Hello,

One of my sims disappeared in the game and in the family tree (see image attached).

Why is this happening and how can this be fixed?

Best regards