Index: trunk/ppStack/src/ppStackCamera.c
===================================================================
--- trunk/ppStack/src/ppStackCamera.c	(revision 17427)
+++ trunk/ppStack/src/ppStackCamera.c	(revision 17428)
@@ -328,12 +328,14 @@
     // Sources for use as stamps
     bool status = false;                // Found the file?
-    pmFPAfile *sources = pmFPAfileDefineFromArgs(&status, config, "PPSTACK.SOURCES", "PPSTACK.SOURCES");
-    if (!status) {
-        psError(PS_ERR_IO, false, "Failed to load file definition PPSTACK.SOURCES");
-        return false;
-    }
-    if (sources && sources->type != PM_FPA_FILE_CMF) {
-        psError(PS_ERR_IO, true, "PPSTACK.SOURCES is not of type CMF");
-        return false;
+    if (havePSFs) {
+        pmFPAfile *sources = pmFPAfileDefineFromArgs(&status, config, "PPSTACK.SOURCES", "PPSTACK.SOURCES");
+        if (!status) {
+            psError(PS_ERR_IO, false, "Failed to load file definition PPSTACK.SOURCES");
+            return false;
+        }
+        if (sources && sources->type != PM_FPA_FILE_CMF) {
+            psError(PS_ERR_IO, true, "PPSTACK.SOURCES is not of type CMF");
+            return false;
+        }
     }