[strongSwan] preparing MySQL statement failed: Commands out of sync; you can't run this command now

[Giuseppe De Marco]

Using
Linux strongSwan U5.6.0/K4.9.0-4-amd64

compiled from sources on a Debian9, using mysql as database.
ipsec pool works very well, everything but --replace command that fails:

ipsec pool --replace net1_pool --addresses /etc/ipsec.pools
preparing MySQL statement failed: Commands out of sync; you can't run this
command now
deleting pool failed.
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