lib: properly handle parse errors at EOF

At EOF, ut_parse_error() will receive 0 as token offset, which led to a
null pointer dereference when creating the exception value.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/lib.c b/lib.c
index 2dba05b..bbc60a6 100644
--- a/lib.c
+++ b/lib.c
@@ -199,7 +199,9 @@ ut_parse_error(struct ut_state *s, uint32_t off, uint64_t *tokens, int max_token
 		}
 	}
 
-	rv = ut_new_exception(s, op->off, "Syntax error: Unexpected token\n%s", msg);
+	rv = ut_new_exception(s,
+	                      op ? op->off : s->lex.lastoff,
+	                      "Syntax error: Unexpected token\n%s", msg);
 	free(msg);
 
 	return rv;