To reproduce:
1. Open attached project ("case_1222515.zip")
2. From Hierarchy window select "Test1" Game Object
3. In the Inspector window expand the Texture Sheet Animation module
4. Duplicate "Test1" Game Object
5. Select both "Test1" and "Test3" (newly duplicated) Game Objects
6. Observe the Console window

Expected result: No errors are thrown
Actual result: 'NullReferenceException: : SerializedProperty is null' errors are thrown

Reproducible in: 2017.4.37f1, 2018.4.18f1, 2019.3.3f1, 2020.1.0a25

Notes:
1. Particle Systems Texture Sheet Animation module has to be set to Sprite and number of Sprites has to be equals or greater than 65
2. It's enough for only 1 of the Particle Systems to have its Texture Sheet Animation module expanded
3. Multi-editing window in the Inspector will be glitchy and unusable