diff --git a/c/tex_parser/tex_table.c b/c/tex_parser/tex_table.c
index 1a23a5c..76378c2 100644
--- a/c/tex_parser/tex_table.c
+++ b/c/tex_parser/tex_table.c
@@ -37,7 +37,7 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 		switch (where_stack[tex_level]) {
 		case IN_UNDEF:
 			if (c == '\\') {
-				zfree(tag); tag = NULL;
+				tag = zfree_null(tag);
 				where_stack[tex_level] = IN_TAG;
 			} else if (c == '%') {
 				where_stack[++tex_level] = IN_COMMENT;