Index: trunk/ppSim/src/ppSimAddOverscan.c
===================================================================
--- trunk/ppSim/src/ppSimAddOverscan.c	(revision 14657)
+++ trunk/ppSim/src/ppSimAddOverscan.c	(revision 18011)
@@ -4,4 +4,8 @@
 
     bool mdok;
+
+    // skip this step if we did not generate a bias level
+    if (biasCols == NULL) return true;
+    if (biasRows == NULL) return true;
 
     psMetadata *recipe = psMetadataLookupMetadata(NULL, config->recipes, PPSIM_RECIPE); // Recipe