Steps to reproduce:
1. Create a new user or make sure you already have a secondary Windows user
2. Create a new project (possible to skip this if you already have one)
3. Navigate to the project's folder and open Library
4. Find SourceAssetDB file
5. Make it non-readable for the other Windows user (Right-click -> Properties -> Security -> Edit... -> Choose the other user -> Tick "Deny" or Read permission)
6. Log into the other user
7. Attempt to open the project

Reproducible with: 2019.3.0a1, 2019.3.0f6, 2020.1.0a21
Not reproducible with:2017.4.36f1, 2018.4.16f1, 2019.2.20f1

First lines of the stacktrace:
0x00007FF66E4E646F (Unity) mdb_txn_begin
0x00007FF66C2058C2 (Unity) LMDB_Transaction::Open
0x00007FF66C20255A (Unity) LMDB_Transaction::LMDB_Transaction
0x00007FF66C1B8324 (Unity) IsSourceAssetDBVersionCorrect
0x00007FF66C1E5452 (Unity) InitializeAssetDatabaseV2

Notes:
- Versions deemed not reproducible doesn't have SourceAssetDB file in the Library at all
- Usually reproducible by the users when trying to open a project created on another Windows account while the initial account is completely logged off