Index: trunk/psModules/src/imcombine/pmStackReject.c
===================================================================
--- trunk/psModules/src/imcombine/pmStackReject.c	(revision 17299)
+++ trunk/psModules/src/imcombine/pmStackReject.c	(revision 18508)
@@ -23,4 +23,9 @@
     PS_ASSERT_ARRAY_NON_NULL(kernels, NULL);
     PS_ASSERT_ARRAYS_SIZE_EQUAL(subRegions, kernels, NULL);
+
+    // Trivial case
+    if (in->n == 0) {
+        return psPixelsAllocEmpty(0);
+    }
 
     // Get the original image size