Hi Prin_E,
Sorry for delay in response. We haven’t been able to reproduce this crash internally, and log isn’t giving us much information. Does this crash still occur for you in 4.5.1? Does it happen in a new project, or only your existing project? Does same crash occur in newer engine versions, like 4.6.1?
If you’re still experiencing this crash, please upload a project somewhere and get us a download link so we can try to reproduce it on our end. Thanks!