Index: trunk/ippTools/share/difftool_inputskyfile.sql
===================================================================
--- trunk/ippTools/share/difftool_inputskyfile.sql	(revision 14256)
+++ trunk/ippTools/share/difftool_inputskyfile.sql	(revision 14257)
@@ -4,5 +4,5 @@
         diffRun.skycell_id,
         diffRun.tess_id,
-        NULL as stack_id,
+        0 as stack_id,
         warpSkyfile.warp_id,
         warpSkyfile.uri,
@@ -35,5 +35,5 @@
         diffRun.tess_id,
         stackSumSkyfile.stack_id,
-        NULL as warp_id,
+        0 as warp_id,
         stackSumSkyfile.uri,
         stackSumSkyfile.path_base,