diff --git a/pkg/handlers/namespaces.go b/pkg/handlers/namespaces.go
index a1bde0955..885dc7a03 100644
--- a/pkg/handlers/namespaces.go
+++ b/pkg/handlers/namespaces.go
@@ -15,6 +15,7 @@ import (
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
+	glog "k8s.io/klog"
 )
 
 // MakeNamespacesLister builds a list of namespaces with an "openfaas" tag, or the default name
@@ -24,7 +25,14 @@ func MakeNamespacesLister(defaultNamespace string, clientset kubernetes.Interfac
 
 		res := ListNamespaces(defaultNamespace, clientset)
 
-		out, _ := json.Marshal(res)
+		out, err := json.Marshal(res)
+		if err != nil {
+			glog.Errorf("Failed to list namespaces: %s", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to list namespaces"))
+			return
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 
 		w.WriteHeader(http.StatusOK)
diff --git a/pkg/handlers/reader.go b/pkg/handlers/reader.go
index d521a526f..8723b7f7d 100644
--- a/pkg/handlers/reader.go
+++ b/pkg/handlers/reader.go
@@ -15,6 +15,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
+	glog "k8s.io/klog"
 
 	"github.com/openfaas/faas-netes/pkg/k8s"
 )
@@ -45,7 +46,14 @@ func MakeFunctionReader(defaultNamespace string, clientset *kubernetes.Clientset
 			return
 		}
 
-		functionBytes, _ := json.Marshal(functions)
+		functionBytes, err := json.Marshal(functions)
+		if err != nil {
+			glog.Errorf("Failed to marshal functions: %s", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to marshal functions"))
+			return
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
 		w.Write(functionBytes)
diff --git a/pkg/handlers/replicas.go b/pkg/handlers/replicas.go
index eb37e1555..6d0ef59ae 100644
--- a/pkg/handlers/replicas.go
+++ b/pkg/handlers/replicas.go
@@ -15,6 +15,7 @@ import (
 	"github.com/openfaas/faas-provider/types"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
+	glog "k8s.io/klog"
 )
 
 // MakeReplicaUpdater updates desired count of replicas
@@ -115,7 +116,14 @@ func MakeReplicaReader(defaultNamespace string, clientset *kubernetes.Clientset)
 
 		log.Printf("Read replicas - %s %s, %d/%d\n", functionName, lookupNamespace, function.AvailableReplicas, function.Replicas)
 
-		functionBytes, _ := json.Marshal(function)
+		functionBytes, err := json.Marshal(function)
+		if err != nil {
+			glog.Errorf("Failed to marshal function: %s", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to marshal function"))
+			return
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
 		w.Write(functionBytes)
diff --git a/pkg/server/info.go b/pkg/server/info.go
index 5553037e7..fd9fd3e74 100644
--- a/pkg/server/info.go
+++ b/pkg/server/info.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/openfaas/faas-netes/version"
 	"github.com/openfaas/faas-provider/types"
+	glog "k8s.io/klog"
 )
 
 // makeInfoHandler provides the system/info endpoint
@@ -27,8 +28,9 @@ func makeInfoHandler() http.HandlerFunc {
 
 		infoBytes, err := json.Marshal(info)
 		if err != nil {
+			glog.Errorf("Failed to marshal info: %s", err.Error())
 			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte(err.Error()))
+			w.Write([]byte("Failed to marshal info"))
 			return
 		}
 
diff --git a/pkg/server/list.go b/pkg/server/list.go
index ef4febb04..b317ed05b 100644
--- a/pkg/server/list.go
+++ b/pkg/server/list.go
@@ -67,10 +67,16 @@ func makeListHandler(defaultNamespace string,
 			functions = append(functions, function)
 		}
 
-		functionBytes, _ := json.Marshal(functions)
+		functionBytes, err := json.Marshal(functions)
+		if err != nil {
+			glog.Errorf("Failed to marshal functions: %s", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to marshal functions"))
+			return
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
 		w.Write(functionBytes)
-
 	}
 }
diff --git a/pkg/server/namespace.go b/pkg/server/namespace.go
index 15dba36e7..7b31d9a0a 100644
--- a/pkg/server/namespace.go
+++ b/pkg/server/namespace.go
@@ -6,13 +6,21 @@ import (
 
 	"github.com/openfaas/faas-netes/pkg/handlers"
 	"k8s.io/client-go/kubernetes"
+	glog "k8s.io/klog"
 )
 
 func makeListNamespaceHandler(defaultNamespace string, clientset kubernetes.Interface) func(http.ResponseWriter, *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		res := handlers.ListNamespaces(defaultNamespace, clientset)
 
-		out, _ := json.Marshal(res)
+		out, err := json.Marshal(res)
+		if err != nil {
+			glog.Errorf("Failed to marshal namespaces: %s", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to marshal namespaces"))
+			return
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 
 		w.WriteHeader(http.StatusOK)
diff --git a/pkg/server/replicas.go b/pkg/server/replicas.go
index d513e1c91..a69799c57 100644
--- a/pkg/server/replicas.go
+++ b/pkg/server/replicas.go
@@ -53,7 +53,14 @@ func makeReplicaReader(defaultNamespace string, client clientset.Interface, list
 			Namespace:         lookupNamespace,
 		}
 
-		res, _ := json.Marshal(result)
+		res, err := json.Marshal(result)
+		if err != nil {
+			glog.Errorf("Failed to marshal function status: %s", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to marshal function status"))
+			return
+		}
+
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
 		w.Write(res)