Index: trunk/ppMerge/src/ppMergeLoop.c
===================================================================
--- trunk/ppMerge/src/ppMergeLoop.c	(revision 24837)
+++ trunk/ppMerge/src/ppMergeLoop.c	(revision 24908)
@@ -152,4 +152,7 @@
     pmChip *outChip;                    ///< Chip of interest
     while ((outChip = pmFPAviewNextChip(view, outFPA, 1))) {
+        if (!outChip->process || !outChip->file_exists) {
+            continue;
+        }
         if (!pmFPAfileIOChecks(config, view, PM_FPA_BEFORE)) {
             goto ERROR;
@@ -161,4 +164,7 @@
 
         while ((outCell = pmFPAviewNextCell(view, outFPA, 1))) {
+	    if (!outCell->process || !outCell->file_exists) {
+		continue;
+	    }
             if (!pmFPAfileIOChecks(config, view, PM_FPA_BEFORE)) {
                 goto ERROR;