diff --git a/c/tex_parser/tex_table.c b/c/tex_parser/tex_table.c
index 41ca5af..e7bf99e 100644
--- a/c/tex_parser/tex_table.c
+++ b/c/tex_parser/tex_table.c
@@ -381,7 +381,7 @@ int parse_table(const char *table_source, size_t len, struct table_s *table, str
 				where_stack[tex_level--] = IN_UNDEF;
 				i--;
 
-			} else if (isalnum(c) || c == '#') {
+			} else if (isalnum(c) || c == '#' || c == '&' || c < 0) {
 
 			} else {
 				error->code = (int)i;