diff --git a/spwplugin/SpwTcpPacketServer/spwtcppacketserver.cpp b/spwplugin/SpwTcpPacketServer/spwtcppacketserver.cpp
--- a/spwplugin/SpwTcpPacketServer/spwtcppacketserver.cpp
+++ b/spwplugin/SpwTcpPacketServer/spwtcppacketserver.cpp
@@ -23,6 +23,7 @@
 #include "ui_spwtcppacketserver.h"
 #include <QNetworkInterface>
 #include <QByteArray>
+#include <socexplorerengine.h>
 
 SpwTcpPacketServer::SpwTcpPacketServer(QWidget *parent) :
     QWidget(parent),
@@ -161,8 +162,15 @@ void SpwTcpPacketServer::sendSPWPacketUs
                  + ( (unsigned char) data[2] ) * 256
                  +   (unsigned char) data[3];
         char* SPWpacket = (char*)malloc(size);
-        memcpy(SPWpacket,data.data()+4,size);   // 4 bytes will be added later to the packet
-        emit sendSPWPacket(SPWpacket,size);
+        if(SPWpacket!=NULL)
+        {
+            memcpy(SPWpacket,data.data()+4,size);   // 4 bytes will be added later to the packet
+            emit sendSPWPacket(SPWpacket,size);
+        }
+        else
+        {
+                //TODO print some message
+        }
     }
 }
 
@@ -186,10 +194,22 @@ void SpwTcpPacketServer::readReady()
                     onePacketReceived();
                     if(data[0]==(char)0)  // Protocole = 0 => Host to SpaceWire packet transmission
                     {
-                        int size = (data[1]*256*256) + (data[2]*256) + data[3];
+                        // TODO -> change heap allocation to stack risk of memory leak
+                        // if no slot conected to sendSPWPacket signal or segfault if more
+                        // than one receiver.
+                        int size = ( (unsigned char) data[1] ) * 256 * 256
+                                 + ( (unsigned char) data[2] ) * 256
+                                 +   (unsigned char) data[3];
                         char* SPWpacket = (char*)malloc(size);
-                        memcpy(SPWpacket,data.data()+4,size);   // 4 bytes will be added later to the packet
-                        emit sendSPWPacket(SPWpacket,size);
+                        if(SPWpacket!=NULL)
+                        {
+                            memcpy(SPWpacket,data.data()+4,size);   // 4 bytes will be added later to the packet
+                            emit sendSPWPacket(SPWpacket,size);
+                        }
+                        else
+                        {
+                                //TODO print some message
+                        }
                     }
                 }while(soc->bytesAvailable()!=0);
             }