Bug #34813

* match.c (v_freeform): Fail if the data is null,
to avoid a false positive match as an empty line, followed by the type
error of incrementing a nonexistent data line number.

1 files changed, 3 insertions, 0 deletions

diff --git a/match.c b/match.c
index ad260cdc..38fdfc32 100644
--- a/match.c
+++ b/match.c
@@ -1670,6 +1670,9 @@ static val v_freeform(match_files_ctx *c)
   if ((c->spec = rest(c->spec)) == nil) {
     sem_error(first_spec,
               lit("freeform must be followed by a query line"), nao);
+  } else if (!c->data) {
+    debuglf(specline, lit("freeform match failure: no data"), nao);
+    return nil;
   } else {
     val limit = or2(if2(nump(first(vals)), first(vals)),
                     if2(nump(second(vals)), second(vals)));