Index: /trunk/ppMerge/src/ppMergeCombine.c
===================================================================
--- /trunk/ppMerge/src/ppMergeCombine.c	(revision 11206)
+++ /trunk/ppMerge/src/ppMergeCombine.c	(revision 11207)
@@ -229,4 +229,9 @@
                 pmFringeStats *fringe = pmFringeStatsMeasure(regions, readout, options->combine->maskVal);
                 psFree(regions);
+                if (!fringe) {
+                    psError(PS_ERR_UNKNOWN, false, "Unable to measure fringe statistics.\n");
+                    psFree(readout);
+                    return false;
+                }
 
                 psArray *fringes = psArrayAlloc(1); // Array of fringes