Ntop warning: Max num TCP sessions, setting seems to have no effect

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NTOP gives me this warning: Nov 26 15:56:23 ntop[2039]: WARNING: Max num TCP sessions (8192) reached (see -X)

I've tried adjusting the number of sessions to 4*8192, however, I still get the warning. If I show running preferences, it appears my settings are being ignored: "/usr/local/bin/ntop -i em0 -u root -d -4 -x 8102 -X 8192"

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Looks like this setting will always be ignored: https://github.com/pfsense/pfsense-packages/blob/4e3879cf61b174570a0a27ab84fd32040e044222/config/ntop2/ntop.xml