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We compute the + component, i.e., j + = j 0 + j 3 , of the electromagnetic current of a composite spin-one two-fermion system for vanishing momentum transfer component q + = q 0 + q 3 . In particular, we extract the nonvanishing pair production amplitude on the light-front. It is a consequence of the longitudinal zero momentum mode, contributing to the light-front current in the Breit-frame. The covariance of the current is violated, if such pair terms are not included in its matrix elements. We illustrate our discussion with some numerical examples.