Index: trunk/psModules/src/objects/pmPCMdata.c
===================================================================
--- trunk/psModules/src/objects/pmPCMdata.c	(revision 36085)
+++ trunk/psModules/src/objects/pmPCMdata.c	(revision 36089)
@@ -177,4 +177,5 @@
     // set parameter mask based on fitting mode
     int nParams = 0;
+    int nParAll = constraint->paramMask->n;
 
     switch (mode) {
@@ -197,5 +198,5 @@
       case PM_SOURCE_FIT_EXT:
         // fits all params except sky
-        nParams = params->n - 1;
+        nParams = nParAll - 1;
         psVectorInit (constraint->paramMask, 0);
         constraint->paramMask->data.PS_TYPE_VECTOR_MASK_DATA[PM_PAR_SKY] = 1;
@@ -204,5 +205,5 @@
       case PM_SOURCE_FIT_EXT_AND_SKY:
         // fits all params including sky
-        nParams = params->n;
+        nParams = nParAll;
         psVectorInit (constraint->paramMask, 0);
         break;
@@ -223,5 +224,5 @@
 	psVectorInit (constraint->paramMask, 1);
 	constraint->paramMask->data.PS_TYPE_VECTOR_MASK_DATA[PM_PAR_I0] = 0;
-        if (params->n == 7) {
+        if (nParAll == 7) {
 	    nParams = 1;
 	} else {
@@ -234,8 +235,8 @@
         // fits all but index (PAR7) including sky
 	psVectorInit (constraint->paramMask, 0);
-        if (params->n == 7) {
-	    nParams = params->n;
+        if (nParAll == 7) {
+	    nParams = nParAll;
 	} else {
-	    nParams = params->n - 1;
+	    nParams = nParAll - 1;
 	    constraint->paramMask->data.PS_TYPE_VECTOR_MASK_DATA[PM_PAR_7] = 1;
 	}