diff --git a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/rpc-parameters/mqtt-rpc-parameters/mqtt-rpc-parameters.component.ts b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/rpc-parameters/mqtt-rpc-parameters/mqtt-rpc-parameters.component.ts
index 6675baeef9..56d9510e7d 100644
--- a/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/rpc-parameters/mqtt-rpc-parameters/mqtt-rpc-parameters.component.ts
+++ b/ui-ngx/src/app/modules/home/components/widget/lib/gateway/connectors-configuration/rpc-parameters/mqtt-rpc-parameters/mqtt-rpc-parameters.component.ts
@@ -66,8 +66,8 @@ export class MqttRpcParametersComponent implements ControlValueAccessor, Validat
 
   rpcParametersFormGroup: UntypedFormGroup;
 
-  private onChange: (value: RPCTemplateConfigMQTT) => void;
-  private onTouched: () => void;
+  private onChange: (value: RPCTemplateConfigMQTT) => void = (_) => {};
+  private onTouched: () => void = () => {};
 
   private destroy$ = new Subject<void>();