Index: trunk/psastro/src/psastroOneChipFit.c
===================================================================
--- trunk/psastro/src/psastroOneChipFit.c	(revision 41895)
+++ trunk/psastro/src/psastroOneChipFit.c	(revision 42289)
@@ -217,4 +217,8 @@
         validSolution = false;
     }
+    if (!chip->fromFPA) {
+        psLogMsg("psastro", PS_LOG_INFO, "toFPA/fromFPA inversion failure");
+        validSolution = false;
+    }
 
     // DVO expects NASTRO = 0 if we fail to find a solution