diff --git a/internal/runner/nomad_manager.go b/internal/runner/nomad_manager.go
index ac3c79a..c0d2ab3 100644
--- a/internal/runner/nomad_manager.go
+++ b/internal/runner/nomad_manager.go
@@ -146,6 +146,11 @@ func (m *NomadRunnerManager) onAllocationAdded(alloc *nomadApi.Allocation, start
 		return
 	}
 
+	if _, ok := m.usedRunners.Get(alloc.JobID); ok {
+		log.WithField("id", alloc.JobID).Debug("Started Runner is already in use")
+		return
+	}
+
 	environmentID, err := nomad.EnvironmentIDFromRunnerID(alloc.JobID)
 	if err != nil {
 		log.WithError(err).Warn("Allocation could not be added")
diff --git a/internal/runner/nomad_manager_test.go b/internal/runner/nomad_manager_test.go
index 2789dcf..6056a72 100644
--- a/internal/runner/nomad_manager_test.go
+++ b/internal/runner/nomad_manager_test.go
@@ -321,19 +321,29 @@ func (s *ManagerTestSuite) TestOnAllocationAdded() {
 			s.True(ok)
 			mockIdleRunners(environment.(*ExecutionEnvironmentMock))
 
+			_, ok = environment.Sample()
+			s.Require().False(ok)
+
 			alloc := &nomadApi.Allocation{
 				JobID:              tests.DefaultRunnerID,
 				AllocatedResources: nil,
 			}
 			s.nomadRunnerManager.onAllocationAdded(alloc, 0)
 
-			runner, ok := environment.Sample()
-			s.True(ok)
+			runner, err := s.nomadRunnerManager.Claim(defaultEnvironmentID, defaultInactivityTimeout)
+			s.NoError(err)
 			nomadJob, ok := runner.(*NomadJob)
 			s.True(ok)
 			s.Equal(nomadJob.id, tests.DefaultRunnerID)
 			s.Empty(nomadJob.portMappings)
+
+			s.Run("but not again", func() {
+				s.nomadRunnerManager.onAllocationAdded(alloc, 0)
+				runner, err = s.nomadRunnerManager.Claim(defaultEnvironmentID, defaultInactivityTimeout)
+				s.Error(err)
+			})
 		})
+		s.nomadRunnerManager.usedRunners.Purge()
 		s.Run("with mapped ports", func() {
 			environment, ok := s.nomadRunnerManager.environments.Get(tests.DefaultEnvironmentIDAsString)
 			s.True(ok)
diff --git a/pkg/monitoring/influxdb2_middleware.go b/pkg/monitoring/influxdb2_middleware.go
index a566d73..e1efeba 100644
--- a/pkg/monitoring/influxdb2_middleware.go
+++ b/pkg/monitoring/influxdb2_middleware.go
@@ -166,7 +166,7 @@ func WriteInfluxPoint(p *write.Point) {
 		for _, field := range p.FieldList() {
 			entry = entry.WithField(field.Key, field.Value)
 		}
-		entry.Debug("Influx data point")
+		entry.Trace("Influx data point")
 	}
 }