The present invention relates to a method for operating a resonant power converter (1) having a primary stage (2) and a secondary stage (3) at least one of which is actively operated and includes a half-bridge or full-bridge inverter (21) having a pull-up switching device (S1) coupled in parallel with a pull-up antiparallel diode (D1) and a pull-down switching device (S2) coupled in parallel with a pull-down antiparallel diode (D2), comprising the steps of: - alternately turning-off and turning on the pull-up (S1) and pull-down switching devices (S2) according to a periodic switching scheme, wherein after turning-off one of the switching devices (S1, S2) the complementary switching device (S2, S1) is respectively turned on after a delay time; - initiating an error handling, if after turning-off of one of the switching devices (S1, S2) a non-conductance state of the antiparallel diode (D1, D2) of the complementary switching device (S2, S1) has been determined.