From 9a2203b9bbf7e8c0da802c2317eca3fdd4a3af36 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Tue, 25 Feb 2025 17:32:44 +0100
Subject: [PATCH] pstats: Backport fix for crash when receiving frames out of
 order

---
 pandatool/src/pstatserver/pStatThreadData.cxx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pandatool/src/pstatserver/pStatThreadData.cxx b/pandatool/src/pstatserver/pStatThreadData.cxx
index bef18c8a24..1df4e7c0e7 100644
--- a/pandatool/src/pstatserver/pStatThreadData.cxx
+++ b/pandatool/src/pstatserver/pStatThreadData.cxx
@@ -290,6 +290,14 @@ record_new_frame(int frame_number, PStatFrameData *frame_data) {
   }
 
   int index = frame_number - _first_frame_number;
+
+  // It's possible to receive frames out of order.
+  while (index < 0) {
+    _frames.push_front(nullptr);
+    ++index;
+    --_first_frame_number;
+  }
+
   nassertv(index >= 0 && index < (int)_frames.size());
 
   if (_frames[index] != nullptr) {