Ok, got more info now:
It is Acustica Audio Trinity eQ. What is strange is the thing that it is 64-bit plugin, not 32-bit plugin.
Problem signature:
Problem Event Name: APPCRASH
Application Name: reaper.exe
Application Version: 5.3.0.0
Application Timestamp: 5856ad8f
Fault Module Name: TRINITYEQ.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 53246fd9
Exception Code: c0000005
Exception Offset: 00000000000126ac
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1029
Additional Information 1: bdaa
Additional Information 2: bdaa39d5c4f6f2c57bf196a9132d7e40
Additional Information 3: ba8d
Additional Information 4: ba8d64640d5b2b6ff07b9021081a9a0c
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