diff --git a/src/workflow.py b/src/workflow.py
index c0fa883683edf1d4fc9e6ec951c2cdba3d362f57..db2d7a38877de42b980d4b3a117d802f89b42c52 100644
--- a/src/workflow.py
+++ b/src/workflow.py
@@ -33,6 +33,8 @@ class Workflow:
         self.keywords = keywords
         self.producer = producer
         self.publisher = publisher
+        if(processes_2_remove==""):
+            processes_2_remove = None
         self.processes_2_remove = processes_2_remove
         self.log = ""
         self.fill_log()