Tinyxml++ exception in release build

int main(int argc, char* args[])
{
	using namespace ticpp;

	Document xml_doc("settings.xml");
	xml_doc.LoadFile();
    
	return 0;
}

bool TiXmlDocument::LoadFile( FILE* file, TiXmlEncoding encoding )
{
        if ( !file )
        {
                SetError( TIXML_ERROR_OPENING_FILE, 0, 0, TIXML_ENCODING_UNKNOWN );
                return false;
        }

        // Delete the existing data:
        Clear();
        location.Clear();

        // Get the file size, so we can pre-allocate the string. HUGE speed impact.
        long length = 0;
        fseek( file, 0, SEEK_END );
        length = ftell( file );
        fseek( file, 0, SEEK_SET );

        // Strange case, but good to handle up front.
        if ( length <= 0 )
        {
                SetError( TIXML_ERROR_DOCUMENT_EMPTY, 0, 0, TIXML_ENCODING_UNKNOWN );
                return false;
        }

        // If we have a file, assume it is all one big XML file, and read it in.
        // The document parser may decide the document ends sooner than the entire file, however.
        TIXML_STRING data;
        data.reserve( length );

        // Subtle bug here. TinyXml did use fgets. But from the XML spec:
        // 2.11 End-of-Line Handling
        // <snip>
        // <quote>
        // ...the XML processor MUST behave as if it normalized all line breaks in external
        // parsed entities (including the document entity) on input, before parsing, by translating
        // both the two-character sequence #xD #xA and any #xD that is not followed by #xA to
        // a single #xA character.
        // </quote>
        //
        // It is not clear fgets does that, and certainly isn't clear it works cross platform.
        // Generally, you expect fgets to translate from the convention of the OS to the c/unix
        // convention, and not work generally.

        /*
        while( fgets( buf, sizeof(buf), file ) )
        {
                data += buf;
        }
        */


        char* buf = new char[ length+1 ];
        buf[0] = 0;

        if ( fread( buf, length, 1, file ) != 1 ) {
                delete [] buf;
                SetError( TIXML_ERROR_OPENING_FILE, 0, 0, TIXML_ENCODING_UNKNOWN );
                return false;
        }

        const char* lastPos = buf;
        const char* p = buf;

        buf[length] = 0;
        while( *p ) {
                assert( p < (buf+length) );
                if ( *p == 0xa ) {
                        // Newline character. No special rules for this. Append all the characters
                        // since the last string, and include the newline.
                        data.append( lastPos, (p-lastPos+1) );  // append, include the newline
                        ++p;                                                                    // move past the newline
                        lastPos = p;                                                    // and point to the new buffer (may be 0)
                        assert( p <= (buf+length) );
                }
                else if ( *p == 0xd ) {
                        // Carriage return. Append what we have so far, then
                        // handle moving forward in the buffer.
                        if ( (p-lastPos) > 0 ) {
                                data.append( lastPos, p-lastPos );      // do not add the CR
                        }
                        data += (char)0xa;                                              // a proper newline

                        if ( *(p+1) == 0xa ) {
                                // Carriage return - new line sequence
                                p += 2;
                                lastPos = p;
                                assert( p <= (buf+length) );
                        }
                        else {
                                // it was followed by something else...that is presumably characters again.
                                ++p;
                                lastPos = p;
                                assert( p <= (buf+length) );
                        }
                }
                else {
                        ++p;
                }
        }
        // Handle any left over characters.
        if ( p-lastPos ) {
                data.append( lastPos, p-lastPos );
        }
        delete [] buf;
        buf = 0;

        Parse( data.c_str(), 0, encoding );

        if (  Error() )
        return false;
    else
                return true;
}