Hi, Why does this throw an exception?

Unhandled org.jblas.exceptions.LapackException LAPACK DGESV: Linear equation cannot be solved because the matrix was singular. SimpleBlas.java: 274 org.jblas.SimpleBlas/gesv Solve.java: 50 org.jblas.Solve/solve core.clj: 1023 clatrix.core/solve core.clj: 1035 clatrix.core/i core.clj: 788 incanter.core/solve stats.clj: 2092 incanter.stats/linear-model

That one above doesn’t throw the exception, for some reason

I am using incanter 1.9.0 with clojure 1.7.0 on Java(TM) SE Runtime Environment (build 1.8.0_73-b02)