[= Ellis;543736]
UPDATE: I assume the crash you are experiencing may be the same as reported here: 4.12.1 Crash when trying to compile (DEMO PROJECT) - Programming & Scripting - Epic Developer Community Forums
This was inadvertently introduced in 4.12.1, and we are currently working to resolve this in a new hotfix as soon as possible.
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I can confirm I’m also getting this crash, i can’t compile any of my blueprints waiting for a fix ASAP thanks.