Index: trunk/psModules/src/concepts/pmConceptsWrite.c
===================================================================
--- trunk/psModules/src/concepts/pmConceptsWrite.c	(revision 10967)
+++ trunk/psModules/src/concepts/pmConceptsWrite.c	(revision 11257)
@@ -209,5 +209,5 @@
         while ((key = psListGetAndIncrement(keysIter))) {
             psMetadataItem *value = psListGetAndIncrement(valuesIter); // Value from iteration; may be NULL
-            status |= writeSingleHeader(hdu, key, value);
+            status &= writeSingleHeader(hdu, key, value);
         }
         psFree(keysIter);