A mobile working machine comprising: - a chassis; - two or more stabilizer legs for supporting the mobile working machine against the ground, wherein the stabilizer legs are connected to the chassis, each stabilizer leg having an actuating member, preferably in the form of a hydraulic cylinder, by means of which the stabilizer leg is manoeuvrable between an inactive position, in which the stabilizer leg is out of contact with the ground, and an active supporting position, in which the stabilizer leg is in supporting contact with the ground; - a hydraulic crane, which is carried by the chassis and comprises: • a crane base fixed to the chassis, • a column, which is rotatably mounted to the crane base so as to be rotatable in relation to the crane base about an essentially vertical axis of rotation, and • a crane boom system carried by the column, wherein the crane boom system comprises at least a first liftable and lowerable crane boom, which is articulately connected to the column, and a hydraulic cylinder, here denominated lifting cylinder, for lifting and lowering the first crane boom in relation to the column; and - an electronic control device, which is configured to establish a maximum allowed working pressure for the lifting cylinder while taking into account the contribution to the stability of the mobile working machine against tipping from each stabilizer leg that is in the active supporting position, characterized in that the electronic control device is configured to prevent a manoeuvring of a stabilizer leg from the active supporting position towards the inactive position if it is established by the electronic control device that the prevailing working pressure of the lifting cylinder is higher than a variable threshold value (V th) established by the electronic control device as a value corresponding to the value of the maximum allowed working pressure for the lifting cylinder that would ensue in case the stabilizer leg in question is made to leave the active supporting position, wherein the electronic control device is configured to enable such a manoeuvring of the stabilizer leg if it is established by the electronic control device that the prevailing working pressure of the lifting cylinder is lower than said threshold value (V th). - a chassis; - two or more stabilizer legs for supporting the mobile working machine against the ground, wherein the stabilizer legs are connected to the chassis, each stabilizer leg having an actuating member, preferably in the form of a hydraulic cylinder, by means of which the stabilizer leg is manoeuvrable between an inactive position, in which the stabilizer leg is out of contact with the ground, and an active supporting position, in which the stabilizer leg is in supporting contact with the ground; - a hydraulic crane, which is carried by the chassis and comprises: • a crane base fixed to the chassis, • a column, which is rotatably mounted to the crane base so as to be rotatable in relation to the crane base about an essentially vertical axis of rotation, and • a crane boom system carried by the column, wherein the crane boom system comprises at least a first liftable and lowerable crane boom, which is articulately connected to the column, and a hydraulic cylinder, here denominated lifting cylinder, for lifting and lowering the first crane boom in relation to the column; and • a crane base fixed to the chassis, • a column, which is rotatably mounted to the crane base so as to be rotatable in relation to the crane base about an essentially vertical axis of rotation, and • a crane boom system carried by the column, wherein the crane boom system comprises at least a first liftable and lowerable crane boom, which is articulately connected to the column, and a hydraulic cylinder, here denominated lifting cylinder, for lifting and lowering the first crane boom in relation to the column; and - an electronic control device, which is configured to establish a maximum allowed working pressure for the lifting cylinder while taking into account the contribution to the stability of the mobile working machine against tipping from each stabilizer leg that is in the active supporting position,