Just bought MusicBoxAlpha and get an error every time when closing the program

[Mark]

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: MusicBoxAlpha.exe
Problem Signature 02: 0.21.7466.22042
Problem Signature 03: 5ee1312e
Problem Signature 04: mscorlib
Problem Signature 05: 4.8.3761.0
Problem Signature 06: 5c9c6be8
Problem Signature 07: 5d20
Problem Signature 08: 26
Problem Signature 09: FOPL4MYEJCHQ4QUDLY5M1JG1EE1KJYWU
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: ae8f
Additional Information 2: ae8f4785582671b52203e63630f334fb
Additional Information 3: 5982
Additional Information 4: 598282af44cdc64d1db3702b98a9cd8d

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