diff --git a/cocluto/ClusterController/Job.py b/cocluto/ClusterController/Job.py
index fa69d70..ae2b27a 100644
--- a/cocluto/ClusterController/Job.py
+++ b/cocluto/ClusterController/Job.py
@@ -29,7 +29,8 @@ class JobId:
 	"""
 	MAX_NUM_JOBS_IN_ARRAY = 1000000
 	def __init__( self, iJobId, iJobArrayElementId = None):
-		assert iJobArrayElementId <= self.MAX_NUM_JOBS_IN_ARRAY
+		if iJobArrayElementId is not None:
+			assert iJobArrayElementId <= self.MAX_NUM_JOBS_IN_ARRAY
 		self.m_iJobId = iJobId
 		self.m_iJobArrayElementId = iJobArrayElementId # None if this identifier does not refer to a job array element