diff --git a/scripts/grepper256.sge b/scripts/grepper256.sge
index 178f4d2..7844017 100755
--- a/scripts/grepper256.sge
+++ b/scripts/grepper256.sge
@@ -11,8 +11,6 @@
 # qsub grepper256.sge DBPATH EXTENSIONCRAWLERPATH
 #     OUTPATH                 out path
 #     EXTENSIONCRAWLERPATH    ExtensionCrawler git repo
-set -u
-
 OUTPATH="$1"
 EXTENSIONCRAWLERDIR="$2"
 
@@ -21,4 +19,6 @@ source $EXTENSIONCRAWLERDIR/scripts/sge_common
 load_python
 override_vars
 
+set -u
+
 python "$EXTENSIONCRAWLERDIR/grepper" -a "$(get_last_snapshot_dir)" -p "$(task_id_to_letter_256 $SGE_TASK_ID)" "$OUTPATH" "amazon" "&tag="
diff --git a/scripts/merge_dbs.sge b/scripts/merge_dbs.sge
index 662c423..2a24243 100755
--- a/scripts/merge_dbs.sge
+++ b/scripts/merge_dbs.sge
@@ -7,8 +7,6 @@
 #     DBDIR                   base dir for the generated db files
 #     OUTDBPATH               the generated full db
 #     EXTENSIONCRAWLERPATH    ExtensionCrawler git repo
-set -u
-
 DBDIR="$1"
 OUTDBPATH="$2"
 EXTENSIONCRAWLERDIR="$3"
@@ -16,5 +14,7 @@ EXTENSIONCRAWLERDIR="$3"
 source $EXTENSIONCRAWLERDIR/scripts/sge_common
 override_vars
 
+set -u
+
 find $DBDIR -name "*.sqlite" -exec bash -c "sqlite3 {} .schema | sqlite3 $OUTDBPATH" \; -quit
 find $DBDIR -name "*.sqlite" -exec "$EXTENSIONCRAWLERDIR/scripts/merge_dbs.sh" "{}" "$OUTDBPATH" \;
diff --git a/scripts/sqlite256.sge b/scripts/sqlite256.sge
index c4897a5..12abfb8 100755
--- a/scripts/sqlite256.sge
+++ b/scripts/sqlite256.sge
@@ -11,8 +11,6 @@
 # qsub sqlite256.sge DBPATH EXTENSIONCRAWLERPATH
 #     DBPATH                  base dir for the generated db files
 #     EXTENSIONCRAWLERPATH    ExtensionCrawler git repo
-set -u
-
 DBPATH="$1"
 EXTENSIONCRAWLERDIR="$2"
 
@@ -21,4 +19,6 @@ source $EXTENSIONCRAWLERDIR/scripts/sge_common
 load_python
 override_vars
 
+set -u
+
 python "$EXTENSIONCRAWLERDIR/create-db" -a "$(get_last_snapshot_dir)" -p "$(task_id_to_letter_256 $SGE_TASK_ID)" "$DBPATH"