diff --git a/proxy.go b/proxy.go
index c4ff792..090a204 100644
--- a/proxy.go
+++ b/proxy.go
@@ -141,6 +141,15 @@ func browserErrMsg(js map[string]interface{}) string {
 	return msg
 }
 
+func jsonErrMsg(msg string) string {
+	message := make(map[string]string)
+	message["message"] = msg
+	value := make(map[string]interface{})
+	value["value"] = message
+	result, _ := json.Marshal(value)
+	return string(result)
+}
+
 func route(w http.ResponseWriter, r *http.Request) {
 	start := time.Now()
 	id := serial()
@@ -194,7 +203,7 @@ loop:
 			}
 		}
 	}
-	http.Error(w, fmt.Sprintf(`{"status": 13, "value" : {"message" : "cannot create session %s on any hosts after %d attempt(s)"}}`, fmtBrowser(browser, version), count), http.StatusInternalServerError)
+	http.Error(w, jsonErrMsg(fmt.Sprintf("cannot create session %s on any hosts after %d attempt(s)", fmtBrowser(browser, version), count)), http.StatusInternalServerError)
 	log.Printf("[%d] [SESSION_NOT_CREATED] [%s] [%s] [%s]\n", id, user, remote, fmtBrowser(browser, version))
 }
 
diff --git a/proxy_test.go b/proxy_test.go
index fca842e..d33d0a4 100644
--- a/proxy_test.go
+++ b/proxy_test.go
@@ -248,6 +248,36 @@ func TestStartSession(t *testing.T) {
 	AssertThat(t, rsp, AllOf{Code{http.StatusOK}, Body{`{"sessionId":"` + node.sum() + `123"}`}})
 }
 
+func TestStartSessionWithJsonSpecChars(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/wd/hub/session", postOnly(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(`{"sessionId":"123"}`))
+	}))
+	selenium := httptest.NewServer(mux)
+	defer selenium.Close()
+
+	host, port := hostportnum(selenium.URL)
+	node := Host{Name: host, Port: port, Count: 1}
+
+	test.Lock()
+	defer test.Unlock()
+
+	config = Browsers{Browsers: []Browser{
+		Browser{Name: "{browser}", DefaultVersion: "1.0", Versions: []Version{
+			Version{Number: "1.0", Regions: []Region{
+				Region{Hosts: Hosts{
+					node,
+				}},
+			}},
+		}}}}
+	routes = linkRoutes(&config)
+
+	rsp, err := http.Post(gridrouter("/wd/hub/session"), "", bytes.NewReader([]byte(`{"desiredCapabilities":{"browserName":"{browser}", "version":"1.0"}}`)))
+
+	AssertThat(t, err, Is{nil})
+	AssertThat(t, rsp, AllOf{Code{http.StatusOK}, Body{`{"sessionId":"` + node.sum() + `123"}`}})
+}
+
 func TestStartSessionFail(t *testing.T) {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/wd/hub/session", postOnly(func(w http.ResponseWriter, r *http.Request) {