Index: trunk/tools/diff_inputs.pl
===================================================================
--- trunk/tools/diff_inputs.pl	(revision 21034)
+++ trunk/tools/diff_inputs.pl	(revision 21119)
@@ -64,6 +64,6 @@
     "         OR warpSkyfile.warp_id = diffInputSkyfile.warp2)" .
     " WHERE diff_id = $diff_id";
-$sql .= " AND diffInputSkyfile.skycell_id = $skycell_id" if defined $skycell_id;
-$sql.= " UNION" .
+$sql .= " AND diffInputSkyfile.skycell_id = \'$skycell_id\'" if defined $skycell_id;
+$sql .= " UNION" .
     " SELECT" .
     "     NULL AS warp_path_base," .
@@ -75,5 +75,5 @@
     "         OR stackSumSkyfile.stack_id = diffInputSkyfile.stack2)" .
     " WHERE diff_id = $diff_id";
-$sql .= " AND diffInputSkyfile.skycell_id = $skycell_id" if defined $skycell_id;
+$sql .= " AND diffInputSkyfile.skycell_id = \'$skycell_id\'" if defined $skycell_id;