The Dude Discovery scan Stops at 50%

Need Help – The Dude Discovery Scan Stuck at 50%
Hi everyone! I’m using The Dude v7.20 on a MikroTik hEX S (E60iUGS) to monitor a school network.
When I run network discovery, the scanning process always stops at 50% and no devices are detected.

SNMP is enabled on my router, and everything worked fine yesterday — but now The Dude can’t detect any devices at all.
Has anyone experienced this issue or know what might cause the scan to stop halfway?