diff --git a/lib/include/srslte/radio/radio_multi.h b/lib/include/srslte/radio/radio_multi.h
index efb1e31b6..097fe55e2 100644
--- a/lib/include/srslte/radio/radio_multi.h
+++ b/lib/include/srslte/radio/radio_multi.h
@@ -45,7 +45,8 @@ namespace srslte {
   class radio_multi : public radio
   {
     public: 
-      
+      radio_multi() {}
+      ~radio_multi() {}
       bool init_multi(uint32_t nof_rx_antennas, char *args = NULL, char *devname = NULL);
       bool rx_now(cf_t *buffer[SRSLTE_MAX_PORTS], uint32_t nof_samples, srslte_timestamp_t *rxd_time);
   }; 
diff --git a/lib/src/radio/radio.cc b/lib/src/radio/radio.cc
index f7bd05862..117c626bc 100644
--- a/lib/src/radio/radio.cc
+++ b/lib/src/radio/radio.cc
@@ -81,7 +81,9 @@ bool radio::is_init() {
 
 void radio::stop() 
 {
-  srslte_rf_close(&rf_device);
+  if (is_initialized) {
+    srslte_rf_close(&rf_device);
+  }
 }
 
 void radio::reset()