@@ -43,10 +43,11 @@
 {
 	CFWString *str = ptr;
 	const char *cstr = va_arg(args, const char*);
 
 	if (cstr != NULL) {
+		str->data = NULL;
 		if ((str->data = strdup(cstr)) == NULL)
 			return false;
 
 		str->len = strlen(cstr);
 	} else {