Warning: Operand of null-aware operation in v2.6.4

[xvrh]

My system upgraded me to postgres v2.6.4 released recently. Now I see this warning:

../../../../../.pub-cache/hosted/pub.dev/postgres-2.6.4/lib/src/substituter.dart:24:52: Warning: Operand of null-aware operation '!' has type 'Map<String, dynamic>' which excludes null.
 - 'Map' is from 'dart:core'.
    replace ??= (spec, index) => converter.convert(values![spec.name]);