# HG changeset patch
# User Markus Mützel <markus.muetzel@gmx.de>
# Date 1575839169 -3600
# Node ID d8c53771645c9f281f311872afbd65f4f99a64d4
# Parent  5169ed0ff0f0f4e11f172265a546889ceb9b67a3
Fix crash if first command at debug prompt is empty (bug #57244).

* pt-eval.cc (debugger::repl): Check if tree_statement_list is valid before
using it.

diff -r 5169ed0ff0f0 -r d8c53771645c libinterp/parse-tree/pt-eval.cc
--- a/libinterp/parse-tree/pt-eval.cc	Sun Dec 08 21:39:57 2019 +0100
+++ b/libinterp/parse-tree/pt-eval.cc	Sun Dec 08 22:06:09 2019 +0100
@@ -320,7 +320,8 @@
                     std::shared_ptr<tree_statement_list> stmt_list
                       = debug_parser.statement_list ();
 
-                    stmt_list->accept (tw);
+                    if (stmt_list)
+                      stmt_list->accept (tw);
 
                     if (octave_completion_matches_called)
                       octave_completion_matches_called = false;