Openlitespeed on VPS without swap


I using cyberpanel and openlitespeed on VPS who has 8 CPU-s, 6GB of RAM and 256 MB of swap. Everything works perfectly until the swap is filled 256/256m (which usually happens from 6 to 12h).
Once the swap is filled the site loads slowly and I get a lot of errors in /usr/local/lsws/logs/error.log "No request delivery notification has been received from LSAPI application, possible dead lock." The only help in this situation is to restart the VPS.

What I want to achieve is to somehow force openlitespeed not to use swap (I have a lot of free RAM, at last 4.5GB)

My cyberpanel is V1.9 and OpenLiteSpeed is 1.6.12.