Index: trunk/psLib/src/sys/psMemory.c
===================================================================
--- trunk/psLib/src/sys/psMemory.c	(revision 11416)
+++ trunk/psLib/src/sys/psMemory.c	(revision 11419)
@@ -10,6 +10,6 @@
 *  @author Joshua Hoblitt, University of Hawaii
 *
-*  @version $Revision: 1.90 $ $Name: not supported by cvs2svn $
-*  @date $Date: 2007-01-30 03:00:50 $
+*  @version $Revision: 1.91 $ $Name: not supported by cvs2svn $
+*  @date $Date: 2007-01-30 04:28:08 $
 *
 *  Copyright 2004-2005 Maui High Performance Computing Center, University of Hawaii
@@ -583,4 +583,10 @@
     MUTEX_LOCK(&memBlockListMutex);
 
+    // if topBlock is NULL there's nothing to do
+    if (!topBlock) {
+        MUTEX_UNLOCK(&memBlockListMutex);
+        return 0;
+    }
+
     // find the very first memblock
     psMemBlock *memBlock = NULL;