From ff3c57c8d3f7b552fd9512c34d7a53e32fedfd43 Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf@nereid.pl>
Date: Tue, 14 Jul 2026 21:21:45 +0200
Subject: [PATCH] Category may exist while sections are not filled.

Dereference of end() iterator in section category options list
(profiler/src/profiler/TracyView_Options.cpp:152-153)

The new category list iterates categories = m_worker.GetSectionDescriptions()
(the description map) and then looks up each category in sections = m_worker.
GetSections():

for( const auto& v : categories )
{
    ...
    auto it = sections.find( v.first );
    ImGui::TextDisabled( "(%s)", RealToString( it->second.size() ) );
    ...
}

sectionsDescription is a superset of sections's keys: ProcessSectionSetup
(server/TracyWorker.cpp:7484-7496) inserts into sectionsDescription only,
while ProcessSectionEnter (server/TracyWorker.cpp:7416-7454) inserts into
both. A category set up via TracySectionSetup that has no TracySectionEnter
events yet (or a saved trace containing such a category) will be in
sectionsDescription but not in sections. find returns end() and
it->second.size() is undefined behavior (likely crash).
---
 profiler/src/profiler/TracyView_Options.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/profiler/src/profiler/TracyView_Options.cpp b/profiler/src/profiler/TracyView_Options.cpp
index a32e8634..fba99e6b 100644
--- a/profiler/src/profiler/TracyView_Options.cpp
+++ b/profiler/src/profiler/TracyView_Options.cpp
@@ -150,7 +150,7 @@ void View::DrawOptions()
                     SmallCheckbox( m_worker.GetSectionCategoryDescription( v.first ), &Vis( v.first ) );
                     ImGui::SameLine();
                     auto it = sections.find( v.first );
-                    ImGui::TextDisabled( "(%s)", RealToString( it->second.size() ) );
+                    if( it != sections.end() ) ImGui::TextDisabled( "(%s)", RealToString( it->second.size() ) );
                     ImGui::PopID();
                 }
                 ImGui::TreePop();