Index: SimplexTableau.java
===================================================================
--- SimplexTableau.java	(revision 781141)
+++ SimplexTableau.java	(working copy)
@@ -272,13 +272,13 @@
     private Integer getBasicRow(final int col) {
         Integer row = null;
         for (int i = getNumObjectiveFunctions(); i < getHeight(); i++) {
-            if (!MathUtils.equals(getEntry(i, col), 0.0, epsilon)) {
-                if (row == null) {
-                    row = i;
-                } else {
-                    return null;
-                }
-            }
+          if (MathUtils.equals(getEntry(i, col), 1.0, epsilon) && (row == null)) {
+            row = i;
+          } else if (MathUtils.equals(getEntry(i, col), 0.0, epsilon)) {
+            continue;
+          } else {
+            return null;
+          }
         }
         return row;
     }