What type of 'ne' clause is this?

[Phoebus Apollo]

itaque totum circumspicere triclinium coepi, ne per parietem automatum
aliquod exiret, utique postquam servus verberari coepit, qui
bracchium domini contusum alba potius quam conchyliata involverat lana.

Chapter 54.4-5 of Petronius' Satyricon.

I don't think I've ever come across a ne clause like this - most translations render it 'to see if...'/'in case...' - I can only conclude that it's a fearing clause, but I'm not sure.

 

[Pacifica]

I guess it can be called a fearing clause.

 

[Phoebus Apollo]

I guess it can be called a fearing clause.

Okay, thanks!