Index: trunk/psModules/src/camera/pmFPAMosaic.c
===================================================================
--- trunk/psModules/src/camera/pmFPAMosaic.c	(revision 13299)
+++ trunk/psModules/src/camera/pmFPAMosaic.c	(revision 13300)
@@ -1126,6 +1126,6 @@
         pmAstromWCS *wcs = pmAstromWCSfromHeader(cell->hdu->header); // WCS terms for this cell
         if (!wcs) {
-            psError(PS_ERR_UNEXPECTED_NULL, false, "Unable to read cell WCS to generate chip WCS.");
-            return false;
+            psWarning("Unable to read cell WCS to generate chip WCS --- ignored.");
+            continue;
         }