  Self-interacting vectors are seeing a burst of interest where various groups
demonstrated that the field evolution ends in finite time. Two nonequivalent
criteria have been offered to identify this breakdown: (i) the vector
constraint equation cannot be satisfied beyond a point where the breakdown
occurs, (ii) the dynamics is governed by an effective metric that becomes
singular at the breakdown. We show that (i) identifies a coordinate
singularity, and can be removed by a change of coordinates. Hence, it does not
signify a physical problem, and cannot determine the validity of a theory.
