Index: trunk/psModules/src/concepts/pmConcepts.c
===================================================================
--- trunk/psModules/src/concepts/pmConcepts.c	(revision 9688)
+++ trunk/psModules/src/concepts/pmConcepts.c	(revision 9695)
@@ -130,5 +130,5 @@
 
     bool success = true;                // Success in reading concepts?
-    if (source & PM_CONCEPT_SOURCE_CELLS && !(*read & PM_CONCEPT_SOURCE_CELLS)) {
+    if (source & PM_CONCEPT_SOURCE_CELLS && !(*read & PM_CONCEPT_SOURCE_CELLS) && cell) {
         if (p_pmConceptsReadFromCells(target, *specs, cell)) {
             *read |= PM_CONCEPT_SOURCE_CELLS;