diff --git a/src/requests.c b/src/requests.c
index 0198185..5a4a235 100644
--- a/src/requests.c
+++ b/src/requests.c
@@ -682,7 +682,10 @@ static int networking_packet_indication_btp(EIS_NetworkingPacketIndication_t* np
             its_msg = calloc(1, sizeof(EI2_CAM_t));
             its_msg_type = EI2_MessageId_cam;
             break;
-        }
+	default:
+	    log_debug("[cam] unsupported protocolVersion: %d", pver);
+	    return 1;
+	}
         break;
 
     case EIS_Port_denm:
@@ -694,7 +697,10 @@ static int networking_packet_indication_btp(EIS_NetworkingPacketIndication_t* np
             its_msg = calloc(1, sizeof(EI2_DENM_t));
             its_msg_type = EI2_MessageId_denm;
             break;
-        }
+    	default:
+	    log_debug("[denm] unsupported protocolVersion: %d", pver);
+	    return 1;
+	}
         break;
 
     case EIS_Port_ivim: