Append Unique Instance Name Crash

I’m spawning unique instances of levels, using “Get Streaming Level → Create Instance”.

I want to append the string that makes up the Unique Instance Name. If I place any special characters, including spaces within the string append node it instantly crashes the editor on execution.

My guess for the reason that this is happening only on the “Unique Instance Name” has to do with the asset naming convention not allowing these characters, being that I could use them if I was appending a print string for instance.

If this is intended behaviour rather than a bug it would be good, if possible, to make it throw up an error on compile rather than crashing during execution. If it is not intended behaviour and could be fixed that would be even better!