Index: /trunk/psModules/src/concepts/pmConcepts.c
===================================================================
--- /trunk/psModules/src/concepts/pmConcepts.c	(revision 7408)
+++ /trunk/psModules/src/concepts/pmConcepts.c	(revision 7409)
@@ -571,6 +571,11 @@
 {
     psFree(conceptsFPA);
+    conceptsFPA = NULL;
     psFree(conceptsChip);
+    conceptsChip = NULL;
     psFree(conceptsCell);
+    conceptsCell = NULL;
+
+    conceptsInitialised = false;
 }