diff --git a/Lib/swigerrors.swg b/Lib/swigerrors.swg
index 5b44a2229..32857c498 100644
--- a/Lib/swigerrors.swg
+++ b/Lib/swigerrors.swg
@@ -11,5 +11,6 @@
 #define  SWIG_SystemError    	   -10
 #define  SWIG_AttributeError 	   -11
 #define  SWIG_MemoryError    	   -12 
+#define  SWIG_NullReferenceError   -13