diff --git a/src_main/containers/pideque.h b/src_main/containers/pideque.h
index 2ad92d2e..c40a299b 100755
--- a/src_main/containers/pideque.h
+++ b/src_main/containers/pideque.h
@@ -294,7 +294,7 @@ public:
 		piSwap<T*>(pid_data, other.pid_data);
 		piSwap<size_t>(pid_size, other.pid_size);
 		piSwap<size_t>(pid_rsize, other.pid_rsize);
-		piSwap<size_t>(pid_start, other.pid_start);
+		piSwap<ssize_t>(pid_start, other.pid_start);
 	}
 
 	typedef int (*CompareFunc)(const T * , const T * );
diff --git a/src_main/io/piconnection.cpp b/src_main/io/piconnection.cpp
index 8c0b035c..1b5b65d3 100755
--- a/src_main/io/piconnection.cpp
+++ b/src_main/io/piconnection.cpp
@@ -873,12 +873,20 @@ int PIConnection::writeByFullPath(const PIString & full_path, const PIByteArray
 	PIString fp = PIIODevice::normalizeFullPath(full_path);
 	PIIODevice * dev = __device_pool__->device(fp);
 	//piCout << "SEND" << full_path << fp;
+	if (!dev) {
+		piCoutObj << "No such full path \"" << full_path << "\"!";
+		return -1;
+	}
 	return write(dev, data);
 }
 
 
-int PIConnection::writeByName(const PIString & name, const PIByteArray & data) {
-	PIIODevice * dev = deviceByName(name);
+int PIConnection::writeByName(const PIString & name_, const PIByteArray & data) {
+	PIIODevice * dev = deviceByName(name_);
+	if (!dev) {
+		piCoutObj << "No such device \"" << name_ << "\"!";
+		return -1;
+	}
 	return write(dev, data);
 }