Fix RT #41461 (with a test).

A problem with the perl debugger of writing to an undef $LINEINFO.
Bump $VERSION to 1.42.

For: RT #41461

2 files changed, 15 insertions, 3 deletions

diff --git a/lib/perl5db.pl b/lib/perl5db.pl
index 48ec301e3f..ab82616dfe 100644
--- a/lib/perl5db.pl
+++ b/lib/perl5db.pl
@@ -523,7 +523,7 @@ BEGIN {
 # Debugger for Perl 5.00x; perl5db.pl patch level:
 use vars qw($VERSION $header);
 
-$VERSION = '1.41';
+$VERSION = '1.42';
 
 $header = "perl5db.pl version $VERSION";
 
@@ -6143,7 +6143,11 @@ sub print_lineinfo {
     resetterm(1) if $LINEINFO eq $OUT and $term_pid != $$;
     local $\ = '';
     local $, = '';
-    print $LINEINFO @_;
+    # $LINEINFO may be undef if $noTTY is set or some other issue.
+    if ($LINEINFO)
+    {
+        print {$LINEINFO} @_;
+    }
 } ## end sub print_lineinfo
 
 =head2 C<postponed_sub>
diff --git a/lib/perl5db.t b/lib/perl5db.t
index 26b0581c89..09a86552f8 100644
--- a/lib/perl5db.t
+++ b/lib/perl5db.t
@@ -29,7 +29,7 @@ BEGIN {
     $ENV{PERL_RL} = 'Perl'; # Suppress system Term::ReadLine::Gnu
 }
 
-plan(117);
+plan(119);
 
 my $rc_filename = '.perldb';
 
@@ -108,6 +108,14 @@ EOF
     is( $?, 0, '[perl #116771] autotrace does not crash debugger, exit == 0' );
     like( $output, 'success' , '[perl #116771] code is run' );
 }
+# [ perl #41461] Frame=2 noTTY
+{
+    local $ENV{PERLDB_OPTS} = "frame=2 noTTY nonstop";
+    rc('');
+    my $output = runperl( switches => [ '-d' ], prog => 'print q{success}' );
+    is( $?, 0, '[perl #41461] frame=2 noTTY does not crash debugger, exit == 0' );
+    like( $output, 'success' , '[perl #41461] code is run' );
+}
 
 {
     rc(<<'EOF');