Index: trunk/ppStack/src/ppStackLoop.c
===================================================================
--- trunk/ppStack/src/ppStackLoop.c	(revision 17255)
+++ trunk/ppStack/src/ppStackLoop.c	(revision 17265)
@@ -517,7 +517,15 @@
 #ifndef PS_NO_TRACE
             {
-                pmReadout *ro = readouts->data[0];
-                psTrace("ppStack", 4, "Stack: [%d:%d,%d:%d]\n", ro->col0, ro->col0 + ro->image->numCols,
-                        ro->row0, ro->row0 + ro->image->numRows);
+                pmReadout *ro = NULL;
+                for (int i = 0; i < num && !ro; i++) {
+                    if (!rejected->data[i]) {
+                        continue;
+                    }
+                    ro = readouts->data[i];
+                }
+                if (ro && ro->image) {
+                    psTrace("ppStack", 4, "Stack: [%d:%d,%d:%d]\n", ro->col0, ro->col0 + ro->image->numCols,
+                            ro->row0, ro->row0 + ro->image->numRows);
+                }
             }
 #endif