diff --git a/spug_api/tools/start-api.sh b/spug_api/tools/start-api.sh
index adb5b96..8f8df53 100644
--- a/spug_api/tools/start-api.sh
+++ b/spug_api/tools/start-api.sh
@@ -5,5 +5,7 @@
 # start api service
 
 cd $(dirname $(dirname $0))
-source ./venv/bin/activate
+if [ -f ./venv/bin/activate ]; then
+  source ./venv/bin/activate
+fi
 exec gunicorn -b 127.0.0.1:9001 -w 2 --threads 8 --access-logfile - spug.wsgi
diff --git a/spug_api/tools/start-monitor.sh b/spug_api/tools/start-monitor.sh
index 5194947..ef52f1c 100644
--- a/spug_api/tools/start-monitor.sh
+++ b/spug_api/tools/start-monitor.sh
@@ -5,5 +5,7 @@
 # start monitor service
 
 cd $(dirname $(dirname $0))
-source ./venv/bin/activate
+if [ -f ./venv/bin/activate ]; then
+  source ./venv/bin/activate
+fi
 exec python manage.py runmonitor
diff --git a/spug_api/tools/start-scheduler.sh b/spug_api/tools/start-scheduler.sh
index 37094a5..7e220e1 100644
--- a/spug_api/tools/start-scheduler.sh
+++ b/spug_api/tools/start-scheduler.sh
@@ -5,5 +5,7 @@
 # start schedule service
 
 cd $(dirname $(dirname $0))
-source ./venv/bin/activate
+if [ -f ./venv/bin/activate ]; then
+  source ./venv/bin/activate
+fi
 exec python manage.py runscheduler
diff --git a/spug_api/tools/start-worker.sh b/spug_api/tools/start-worker.sh
index a799f7d..f8c43fd 100644
--- a/spug_api/tools/start-worker.sh
+++ b/spug_api/tools/start-worker.sh
@@ -5,5 +5,7 @@
 # start worker service
 
 cd $(dirname $(dirname $0))
-source ./venv/bin/activate
+if [ -f ./venv/bin/activate ]; then
+  source ./venv/bin/activate
+fi
 exec python manage.py runworker ssh_exec
diff --git a/spug_api/tools/start-ws.sh b/spug_api/tools/start-ws.sh
index c8889a8..f30c3ba 100644
--- a/spug_api/tools/start-ws.sh
+++ b/spug_api/tools/start-ws.sh
@@ -5,5 +5,7 @@
 # start websocket service
 
 cd $(dirname $(dirname $0))
-source ./venv/bin/activate
+if [ -f ./venv/bin/activate ]; then
+  source ./venv/bin/activate
+fi
 exec daphne -p 9002 spug.asgi:application