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When a CU sends a DRB with a non-dynamic 5QI that is not in the DU MAC lookup table, get_non_dynamic_priority() used to AssertFatal and abort. Return -1 and log a warning instead, and skip flows with negative priority when deriving the logical-channel priority so setup can continue. A more spec-aligned fix would require F1AP UE Context Setup/Modification Failure (not implemented) in case of a logical error in the DU: > Where the logical error occurs in a request message of a class 1 procedure, > and the procedure has a message to report this unsuccessful outcome, > this message shall be sent with an appropriate cause value. Signed-off-by: Guido Casati <guido.casati@openairinterface.org>