A hydraulic crane comprising: - a crane base; - 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; - an actuating device for rotating the column in relation to the crane base; - a crane boom system comprising two or more liftable and lowerable crane booms (11, 13) which are articulately connected to each other and hydraulic cylinders (12, 14) for lifting and lowering the crane booms (11, 13), wherein a first crane boom of the crane boom system is articulately connected to the column and a second crane boom of the crane boom system is articulately connected to the first crane boom; - an electronic control device for controlling said actuating device and the hydraulic cylinders (12, 14) of the crane boom system to thereby control the rotation of the column and the positioning of the crane booms (11, 13); and - a manoeuvring unit with one or more maneuvering members (S1, S2, S3) configured to be manoeuvrable by a crane operator in order to control the position of a load suspension point of the crane boom system, wherein the manoeuvring unit is configured to supply the electronic control device with control signals related to the manoeuvring of said one or more maneuvering members (S1, S2, S3), wherein the electronic control device is configured to control the crane boom movements on the basis of said control signals and a calculation model for boom tip control, characterized in: - that the electronic control device in a first control mode is configured to make the load suspension point move along a trajectory defined by said control signals while controlling the crane boom movements in accordance with an ordinary control strategy; and - that the electronic control device is configured to switch from the first control mode into a second control mode when it is established by the electronic control device that the first crane boom is about to interfere with a predefined safety zone associated with a known obstacle or about to interfere with an obstacle detected by means of one or more sensors of the hydraulic crane, wherein the electronic control device in this second control mode is configured to make the load suspension point move along said trajectory while controlling the crane boom movements in accordance with an auxiliary control strategy in which the first crane boom is prevented from interfering with the safety zone or the detected obstacle. - a crane base; - 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; - an actuating device for rotating the column in relation to the crane base; - a crane boom system comprising two or more liftable and lowerable crane booms (11, 13) which are articulately connected to each other and hydraulic cylinders (12, 14) for lifting and lowering the crane booms (11, 13), wherein a first crane boom of the crane boom system is articulately connected to the column and a second crane boom of the crane boom system is articulately connected to the first crane boom; - an electronic control device for controlling said actuating device and the hydraulic cylinders (12, 14) of the crane boom system to thereby control the rotation of the column and the positioning of the crane booms (11, 13); and - a manoeuvring unit with one or more maneuvering members (S1, S2, S3) configured to be manoeuvrable by a crane operator in order to control the position of a load suspension point of the crane boom system, wherein the manoeuvring unit is configured to supply the electronic control device with control signals related to the manoeuvring of said one or more maneuvering members (S1, S2, S3), - that the electronic control device in a first control mode is configured to make the load suspension point move along a trajectory defined by said control signals while controlling the crane boom movements in accordance with an ordinary control strategy; and - that the electronic control device is configured to switch from the first control mode into a second control mode when it is established by the electronic control device that the first crane boom is about to interfere with a predefined safety zone associated with a known obstacle or about to interfere with an obstacle detected by means of one or more sensors of the hydraulic crane, wherein the electronic control device in this second control mode is configured to make the load suspension point move along said trajectory while controlling the crane boom movements in accordance with an auxiliary control strategy in which the first crane boom is prevented from interfering with the safety zone or the detected obstacle.