This is what the windows crash message told. Also thee attached file Arma_3_crash_log_4.9.rar has crash logs of two players who where hosts.
Problem signature:
Problem Event Name: APPCRASH
Application Name: arma3.exe
Application Version: 0.77.109.751
Application Timestamp: 522658ce
Fault Module Name: arma3.exe
Fault Module Version: 0.77.109.751
Fault Module Timestamp: 522658ce
Exception Code: c0000005
Exception Offset: 00d0024f
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1035
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789