Method for operating a gas turbine of a power plant with gaseous fuel and liquid fuel, wherein the gaseous fuel is fed into a combustion chamber of the gas turbine from a gaseous fuel supply through a gaseous fuel supply line at a flow rate adjustable by gaseous fuel flow rate adjusting means, wherein the gaseous fuel flow rate adjusting means is formed by a gaseous fuel control valve, and wherein the liquid fuel is fed into the combustion chamber from a liquid fuel supply through a liquid fuel supply line at a flow rate adjustable by a liquid fuel flow rate adjusting means, the method comprising the steps of: a) simultaneously feeding gaseous fuel at a gaseous fuel flow rate and liquid fuel at a liquid fuel flow rate into the combustion chamber during a normal operational mode of the gas turbine, wherein the gaseous fuel flow rate and the liquid fuel flow rate are adjusted to achieve the desired power output of the gas turbine; b) monitoring the actual gaseous fuel pressure in the gaseous fuel supply line at a position between the gaseous fuel supply and the gaseous fuel control valve; and, c) when the actual gaseous fuel pressure drops below a predetermined gaseous fuel pressure threshold value, leaving the normal operational mode of the gas turbine by automatically decreasing the gaseous fuel flow rate and increasing the liquid fuel flow rate, and characterized by the step of: d) as soon as the actual gaseous fuel pressure reaches a set value above the predetermined gaseous fuel pressure threshold value, entering the normal operational mode of the gas turbine by automatically increasing the gaseous fuel flow rate and decreasing the liquid fuel flow rate, wherein the set gaseous fuel pressure value is 0.3 to 0.7 bar above the predetermined gaseous fuel pressure threshold value. wherein the gaseous fuel is fed into a combustion chamber of the gas turbine from a gaseous fuel supply through a gaseous fuel supply line at a flow rate adjustable by gaseous fuel flow rate adjusting means, wherein the gaseous fuel flow rate adjusting means is formed by a gaseous fuel control valve, and wherein the liquid fuel is fed into the combustion chamber from a liquid fuel supply through a liquid fuel supply line at a flow rate adjustable by a liquid fuel flow rate adjusting means, the method comprising the steps of: a) simultaneously feeding gaseous fuel at a gaseous fuel flow rate and liquid fuel at a liquid fuel flow rate into the combustion chamber during a normal operational mode of the gas turbine, wherein the gaseous fuel flow rate and the liquid fuel flow rate are adjusted to achieve the desired power output of the gas turbine; b) monitoring the actual gaseous fuel pressure in the gaseous fuel supply line at a position between the gaseous fuel supply and the gaseous fuel control valve; and, c) when the actual gaseous fuel pressure drops below a predetermined gaseous fuel pressure threshold value, leaving the normal operational mode of the gas turbine by automatically decreasing the gaseous fuel flow rate and increasing the liquid fuel flow rate, and characterized by the step of: d) as soon as the actual gaseous fuel pressure reaches a set value above the predetermined gaseous fuel pressure threshold value, entering the normal operational mode of the gas turbine by automatically increasing the gaseous fuel flow rate and decreasing the liquid fuel flow rate, a) simultaneously feeding gaseous fuel at a gaseous fuel flow rate and liquid fuel at a liquid fuel flow rate into the combustion chamber during a normal operational mode of the gas turbine, wherein the gaseous fuel flow rate and the liquid fuel flow rate are adjusted to achieve the desired power output of the gas turbine; b) monitoring the actual gaseous fuel pressure in the gaseous fuel supply line at a position between the gaseous fuel supply and the gaseous fuel control valve; and, c) when the actual gaseous fuel pressure drops below a predetermined gaseous fuel pressure threshold value, leaving the normal operational mode of the gas turbine by automatically decreasing the gaseous fuel flow rate and increasing the liquid fuel flow rate, and characterized by the step of: d) as soon as the actual gaseous fuel pressure reaches a set value above the predetermined gaseous fuel pressure threshold value, entering the normal operational mode of the gas turbine by automatically increasing the gaseous fuel flow rate and decreasing the liquid fuel flow rate, wherein the set gaseous fuel pressure value is 0.3 to 0.7 bar above the predetermined gaseous fuel pressure threshold value.