How to draw the phase portrait if two of the eigenvectors are (0,0,0,0) and eigenvalues are positive in one case and negative in other?

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I have two eigenvalues and they are 2wsqrt(2) and -2wsqrt(2) where w is the angular frequency of the system. Both of the eigenvectors corresponding to these eigenvalues are (0,0,0,0) so how can one sketch a phase portrait for it?