Index: trunk/psModules/src/camera/pmHDUUtils.c
===================================================================
--- trunk/psModules/src/camera/pmHDUUtils.c	(revision 7168)
+++ trunk/psModules/src/camera/pmHDUUtils.c	(revision 7278)
@@ -8,4 +8,5 @@
                    )
 {
+    PS_ASSERT_PTR_NON_NULL(fpa, NULL);
     return fpa->hdu;
 }
@@ -14,4 +15,6 @@
                     )
 {
+    PS_ASSERT_PTR_NON_NULL(chip, NULL);
+
     pmHDU *hdu = chip->hdu;             // The HDU information
     if (!hdu) {
@@ -25,4 +28,6 @@
                     )
 {
+    PS_ASSERT_PTR_NON_NULL(cell, NULL);
+
     pmHDU *hdu = cell->hdu;             // The HDU information
     if (!hdu) {
@@ -33,9 +38,10 @@
 }
 
-pmHDU *pmHDUFromReadout (pmReadout *readout)
+pmHDU *pmHDUFromReadout(pmReadout *readout)
 {
+    PS_ASSERT_PTR_NON_NULL(readout, NULL);
 
     pmCell *cell = readout->parent; // cell containing this readout;
-    pmHDU *hdu = pmHDUFromCell (cell);
+    pmHDU *hdu = pmHDUFromCell(cell);
     return hdu;
 }
@@ -64,4 +70,6 @@
                )
 {
+    PS_ASSERT_PTR_NON_NULL(hdu,);
+
     if (hdu->phu) {
         psTrace(__func__, level, "HDU: %s (PHU)\n", hdu->extname);