diff --git a/src/adapters/http/client.ts b/src/adapters/http/client.ts
index d8b35aefa..fe1aa1f24 100644
--- a/src/adapters/http/client.ts
+++ b/src/adapters/http/client.ts
@@ -20,7 +20,7 @@ class HttpClientAdapter extends Adapter {
   async send(message: GleeMessage): Promise<void> {
     const headers = {}
     const config: HttpAdapterConfig = await this.resolveProtocolConfig('http')
-    const auth: HttpAuthConfig = await this.getAuthConfig(config.client.auth)
+    const auth: HttpAuthConfig = await this.getAuthConfig(config?.client?.auth)
     headers['Authentication'] = auth?.token
     const serverUrl = this.serverUrlExpanded
     for (const channelName of this.channelNames) {
diff --git a/src/adapters/kafka/index.ts b/src/adapters/kafka/index.ts
index c856a328a..27fd8f1d4 100644
--- a/src/adapters/kafka/index.ts
+++ b/src/adapters/kafka/index.ts
@@ -14,7 +14,7 @@ class KafkaAdapter extends Adapter {
     const kafkaOptions: KafkaAdapterConfig = await this.resolveProtocolConfig(
       'kafka'
     )
-    const auth: KafkaAuthConfig = await this.getAuthConfig(kafkaOptions.auth)
+    const auth: KafkaAuthConfig = await this.getAuthConfig(kafkaOptions?.auth)
     const securityRequirements = (this.AsyncAPIServer.security() || []).map(
       (sec) => {
         const secName = Object.keys(sec.json())[0]
diff --git a/src/adapters/mqtt/index.ts b/src/adapters/mqtt/index.ts
index 0cb42f1b1..379288646 100644
--- a/src/adapters/mqtt/index.ts
+++ b/src/adapters/mqtt/index.ts
@@ -152,7 +152,7 @@ class MqttAdapter extends Adapter {
     const mqttOptions: MqttAdapterConfig = await this.resolveProtocolConfig(
       'mqtt'
     )
-    const auth: MqttAuthConfig = await this.getAuthConfig(mqttOptions.auth)
+    const auth: MqttAuthConfig = await this.getAuthConfig(mqttOptions?.auth)
     const subscribedChannels = this.getSubscribedChannels()
     const mqttServerBinding = this.AsyncAPIServer.binding('mqtt')
     const mqtt5ServerBinding = this.AsyncAPIServer.binding('mqtt5')
diff --git a/src/adapters/ws/client.ts b/src/adapters/ws/client.ts
index 133927074..6dca108ee 100644
--- a/src/adapters/ws/client.ts
+++ b/src/adapters/ws/client.ts
@@ -32,7 +32,7 @@ class WsClientAdapter extends Adapter {
       const headers = {}
       const wsOptions: WebsocketAdapterConfig =
         await this.resolveProtocolConfig('ws')
-      const auth: WsAuthConfig = await this.getAuthConfig(wsOptions.client.auth)
+      const auth: WsAuthConfig = await this.getAuthConfig(wsOptions?.client?.auth)
       headers['Authentication'] = `bearer ${auth?.token}`
 
       const url = new URL(this.AsyncAPIServer.url() + channel)