diff --git a/src/mwparserfromhell/parser/ctokenizer/tok_parse.c b/src/mwparserfromhell/parser/ctokenizer/tok_parse.c
index 0d3594b..60000d3 100644
--- a/src/mwparserfromhell/parser/ctokenizer/tok_parse.c
+++ b/src/mwparserfromhell/parser/ctokenizer/tok_parse.c
@@ -1770,6 +1770,7 @@ Tokenizer_really_parse_tag(Tokenizer *self)
         return NULL;
     }
     if (Tokenizer_check_route(self, LC_TAG_OPEN) < 0) {
+        TagData_dealloc(data);
         return NULL;
     }
     if (Tokenizer_push(self, LC_TAG_OPEN)) {