1 files changed, 2 insertions, 0 deletions

diff --git a/ue3/mycpu/cinstruction.cpp b/ue3/mycpu/cinstruction.cpp
index 5c1bd5c..a766015 100644
--- a/ue3/mycpu/cinstruction.cpp
+++ b/ue3/mycpu/cinstruction.cpp
@@ -8,6 +8,7 @@
 #include <sstream>
 #include <stdexcept>
 #include <boost/lexical_cast.hpp>
+#include <assert.h>
 #include "cinstruction.h"
 #include "ccpu.h"
 
@@ -35,6 +36,7 @@ const unsigned CInstruction::parseRegister(const std::string& str)
 
 inline void CInstruction::checkRegister(CCPU *cpu, const unsigned regidx)
 {
+  assert(cpu != NULL);
   if (regidx >= cpu->getRegisterCount())
   {
     stringstream sstr;