--- nono/vm/mpscc.cpp	2026/04/29 17:05:38	1.1.1.8
+++ nono/vm/mpscc.cpp	2026/04/29 17:05:42	1.1.1.9
@@ -83,8 +83,11 @@ bool
 MPSCCDevice::Create()
 {
 	// 対応するホストドライバを作成
-	hostcom.reset(new HostCOMDevice(this, "HostCOM"));
+	try {
+		hostcom.reset(new HostCOMDevice(this, "HostCOM"));
+	} catch (...) { }
 	if ((bool)hostcom == false) {
+		warnx("Failed to initialize HostCOMDevice at %s", __method__);
 		return false;
 	}
 	hostcom->SetRxCallback(ToDeviceCallback(&MPSCCDevice::HostRxCallback));
@@ -97,8 +100,9 @@ MPSCCDevice::SetLogLevel(int loglevel_)
 {
 	inherited::SetLogLevel(loglevel_);
 
-	assert((bool)hostcom);
-	hostcom->SetLogLevel(loglevel_);
+	if ((bool)hostcom) {
+		hostcom->SetLogLevel(loglevel_);
+	}
 }
 
 // 初期化