Assertion in StrPair::SetStr()
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index ea8088c..510fc82 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -177,6 +177,7 @@
 

 void StrPair::SetStr( const char* str, int flags )

 {

+    TIXMLASSERT( str );

     Reset();

     size_t len = strlen( str );

     TIXMLASSERT( _start == 0 );