Index: trunk/psModules/src/camera/pmFPAWrite.c
===================================================================
--- trunk/psModules/src/camera/pmFPAWrite.c	(revision 7249)
+++ trunk/psModules/src/camera/pmFPAWrite.c	(revision 7278)
@@ -16,4 +16,7 @@
                        )
 {
+    PS_ASSERT_PTR_NON_NULL(readout, false);
+    PS_ASSERT_PTR_NON_NULL(fits, false);
+
     pmHDU *hdu = pmHDUFromReadout(readout); // The HDU to which to write
     if (!hdu) {
@@ -87,4 +90,7 @@
                 )
 {
+    PS_ASSERT_PTR_NON_NULL(cell, false);
+    PS_ASSERT_PTR_NON_NULL(fits, false);
+
     pmHDU *hdu = cell->hdu;             // The HDU
     if (!hdu) {
@@ -118,4 +124,7 @@
                 )
 {
+    PS_ASSERT_PTR_NON_NULL(chip, false);
+    PS_ASSERT_PTR_NON_NULL(fits, false);
+
     pmHDU *hdu = chip->hdu;             // The HDU
     if (!hdu) {
@@ -156,4 +165,7 @@
                )
 {
+    PS_ASSERT_PTR_NON_NULL(fpa, false);
+    PS_ASSERT_PTR_NON_NULL(fits, false);
+
     pmHDU *hdu = fpa->hdu;              // The HDU
     if (!hdu) {