diff --git a/executor/predictor/predictor_process.go b/executor/predictor/predictor_process.go
index e8c2e1e551..79146a59d9 100644
--- a/executor/predictor/predictor_process.go
+++ b/executor/predictor/predictor_process.go
@@ -30,24 +30,26 @@ var (
 )
 
 type PredictorProcess struct {
-	Ctx       context.Context
-	Client    client.SeldonApiClient
-	Log       logr.Logger
-	ServerUrl *url.URL
-	Namespace string
-	Meta      *payload.MetaData
-	Routing   map[string]int32
+	Ctx          context.Context
+	Client       client.SeldonApiClient
+	Log          logr.Logger
+	ServerUrl    *url.URL
+	Namespace    string
+	Meta         *payload.MetaData
+	Routing      map[string]int32
+	RoutingMutex *sync.RWMutex
 }
 
 func NewPredictorProcess(context context.Context, client client.SeldonApiClient, log logr.Logger, serverUrl *url.URL, namespace string, meta map[string][]string) PredictorProcess {
 	return PredictorProcess{
-		Ctx:       context,
-		Client:    client,
-		Log:       log,
-		ServerUrl: serverUrl,
-		Namespace: namespace,
-		Meta:      payload.NewFromMap(meta),
-		Routing:   make(map[string]int32),
+		Ctx:          context,
+		Client:       client,
+		Log:          log,
+		ServerUrl:    serverUrl,
+		Namespace:    namespace,
+		Meta:         payload.NewFromMap(meta),
+		Routing:      make(map[string]int32),
+		RoutingMutex: &sync.RWMutex{},
 	}
 }
 
@@ -89,14 +91,18 @@ func (p *PredictorProcess) transformInput(node *v1.PredictiveUnit, msg payload.S
 		if err != nil {
 			return nil, err
 		}
+		p.RoutingMutex.Lock()
 		p.Routing[node.Name] = -1
+		p.RoutingMutex.Unlock()
 		return p.Client.Predict(p.Ctx, node.Name, node.Endpoint.ServiceHost, p.getPort(node), msg, p.Meta.Meta)
 	} else if callTransformInput {
 		msg, err := p.Client.Chain(p.Ctx, node.Name, msg)
 		if err != nil {
 			return nil, err
 		}
+		p.RoutingMutex.Lock()
 		p.Routing[node.Name] = -1
+		p.RoutingMutex.Unlock()
 		return p.Client.TransformInput(p.Ctx, node.Name, node.Endpoint.ServiceHost, p.getPort(node), msg, p.Meta.Meta)
 	} else {
 		return msg, nil
@@ -189,7 +195,9 @@ func (p *PredictorProcess) aggregate(node *v1.PredictiveUnit, msg []payload.Seld
 	}
 
 	if callClient {
+		p.RoutingMutex.Lock()
 		p.Routing[node.Name] = -1
+		p.RoutingMutex.Unlock()
 		return p.Client.Combine(p.Ctx, node.Name, node.Endpoint.ServiceHost, p.getPort(node), msg, p.Meta.Meta)
 	} else {
 		return msg[0], nil
@@ -216,7 +224,9 @@ func (p *PredictorProcess) predictChildren(node *v1.PredictiveUnit, msg payload.
 				}(i, nodeChild, msg)
 			}
 			wg.Wait()
+			p.RoutingMutex.Lock()
 			p.Routing[node.Name] = -1
+			p.RoutingMutex.Unlock()
 			for i, err := range errs {
 				if err != nil {
 					return cmsgs[i], err
@@ -224,12 +234,16 @@ func (p *PredictorProcess) predictChildren(node *v1.PredictiveUnit, msg payload.
 			}
 		} else if route == -2 {
 			//Abort and return request
+			p.RoutingMutex.Lock()
 			p.Routing[node.Name] = -2
+			p.RoutingMutex.Unlock()
 			return msg, nil
 		} else {
 			cmsgs = make([]payload.SeldonPayload, 1)
 			cmsgs[0], err = p.Predict(&node.Children[route], msg)
+			p.RoutingMutex.Lock()
 			p.Routing[node.Name] = int32(route)
+			p.RoutingMutex.Unlock()
 			if err != nil {
 				return cmsgs[0], err
 			}