Index: /trunk/ppStack/src/ppStackSources.c
===================================================================
--- /trunk/ppStack/src/ppStackSources.c	(revision 18382)
+++ /trunk/ppStack/src/ppStackSources.c	(revision 18383)
@@ -120,4 +120,5 @@
     list->bounds = NULL;
     list->indices = NULL;
+    list->duplicates = NULL;
 
     psVector *x = NULL, *y = NULL;      // Source coordinates