Index: trunk/psModules/src/imcombine/pmReadoutCombine.c
===================================================================
--- trunk/psModules/src/imcombine/pmReadoutCombine.c	(revision 14342)
+++ trunk/psModules/src/imcombine/pmReadoutCombine.c	(revision 14351)
@@ -247,5 +247,11 @@
                 }
                 #endif
+
                 pixelsData[r] = image->data.F32[yIn][xIn];
+                if (isnan(pixelsData[r])) {
+                    maskData[r] = 1;
+                    continue;
+                }
+
                 if (params->weights) {
                     weightsData[r] = readout->weight->data.F32[yIn][xIn];