If you updated from the previous version killing it and manually running C:\Users\Azin\AppData\Local\Mailspring\App-1.9.2\mailspring.exe will work as a workaround (if you skipped a version swap App-1.9.2 for whatever previous version you find). I imagine they’ll fix it properly pretty fast since there’s a lot of people affected.
Also reported here: Database Error and unable to launch app after installing V1.10.0
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