Fix race condition with debugger on soft reboot

Signed-off-by: josesimoes <jose.simoes@eclo.solutions>

Author: josesimoes

src/CLR/Debugger/Debugger.cpp

@@ -124,6 +124,8 @@ HRESULT CLR_DBG_Debugger::DeleteInstance()
     // free debugger
     platform_free(g_CLR_DBG_Debugger);
 
+    g_CLR_DBG_Debugger = NULL;
+
     NANOCLR_NOCLEANUP_NOLABEL();
 }
 

src/CLR/Messaging/Messaging.cpp

@@ -391,6 +391,11 @@ bool CLR_Messaging::ProcessPayload( WP_Message* msg )
 // wrapper function for CLR_Messaging::ProcessPayload(
 extern "C" int CLR_Messaging_ProcessPayload(WP_Message* msg)
 {
+    if (g_CLR_DBG_Debugger == NULL)
+    {
+        return false;
+    }
+    
     bool retValue = g_CLR_DBG_Debugger->m_messaging->ProcessPayload(msg);
     return retValue;
 }