Index: trunk/psastro/src/psastroParseCamera.c
===================================================================
--- trunk/psastro/src/psastroParseCamera.c	(revision 10438)
+++ trunk/psastro/src/psastroParseCamera.c	(revision 10855)
@@ -22,6 +22,8 @@
     pmFPAfileDefineOutput (config, input->fpa, "PSASTRO.OUTPUT");
 
-    // Chip selection: turn on only the chips specified
+    // Chip selection: turn on only the chips specified (option is not required)
     char *chipLine = psMetadataLookupStr(NULL, config->arguments, "CHIP_SELECTIONS"); 
+    if (chipLine == NULL) psErrorClear();
+
     psArray *chips = psStringSplitArray (chipLine, ",", false);
     if (chips->n > 0) {