A machine for processing a liquid food substance, such as milk or a milk-based substance, comprising: - a jug having a container that delimits a food cavity for containing said liquid food substance, such as a container having a removable lid for covering the cavity; and - a base that has one or more walls forming a seat for removably receiving the container, the base and the jug comprising or delimiting, respectively, an off-centred, e.g. peripheral, projecting member, e.g. a pin or blade, and a corresponding off-centred, e.g. peripheral, seat for the projecting member or vice versa, the off-centred seat being configured to receive the projecting member when the container is received by the base seat such that the container is in place for processing said liquid food substance in the food cavity, the off-centred projecting member being configured to maintain the container off its place for processing said liquid food substance in the cavity when the projecting member is off-set, e.g. angularly off-set, relative to the off-centred seat, optionally the jug comprisinq the off-centred projecting member and the base delimiting the off-centred seat, for instance an outside face of the base delimiting the off-centred seat, wherein such machine comprises a processing device and a control system that is configured to control the processing device for processing said liquid food substance, characterized in that the control system is confiqured to detect when the container is off its processing place by measuring a characteristic of the processing device and comparing such measured characteristic to an expected value thereof when the container is in its processing place or off its processing place, optionally the processing device and/or the control system being contained in the base. - a jug having a container that delimits a food cavity for containing said liquid food substance, such as a container having a removable lid for covering the cavity; and - a base that has one or more walls forming a seat for removably receiving the container, the base and the jug comprising or delimiting, respectively, an off-centred, e.g. peripheral, projecting member, e.g. a pin or blade, and a corresponding off-centred, e.g. peripheral, seat for the projecting member or vice versa, the off-centred seat being configured to receive the projecting member when the container is received by the base seat such that the container is in place for processing said liquid food substance in the food cavity, the off-centred projecting member being configured to maintain the container off its place for processing said liquid food substance in the cavity when the projecting member is off-set, e.g. angularly off-set, relative to the off-centred seat, optionally the jug comprisinq the off-centred projecting member and the base delimiting the off-centred seat, for instance an outside face of the base delimiting the off-centred seat, wherein such machine comprises a processing device and a control system that is configured to control the processing device for processing said liquid food substance, characterized in that the control system is confiqured to detect when the container is off its processing place by measuring a characteristic of the processing device and comparing such measured characteristic to an expected value thereof when the container is in its processing place or off its processing place, optionally the processing device and/or the control system being contained in the base.