diff --git a/server/TracyView.cpp b/server/TracyView.cpp
index 12625de8..4d3bd320 100644
--- a/server/TracyView.cpp
+++ b/server/TracyView.cpp
@@ -1251,7 +1251,7 @@ void View::DrawFrames()
     }
 
     int i = 0, idx = 0;
-    if( m_findZone.show && !m_findZone.match.empty() )
+    if( m_worker.AreSourceLocationZonesReady() && m_findZone.show && !m_findZone.match.empty() )
     {
         auto& zoneData = m_worker.GetZonesForSourceLocation( m_findZone.match[m_findZone.selMatch] );
         auto begin = zoneData.zones.begin();
diff --git a/server/TracyWorker.cpp b/server/TracyWorker.cpp
index 70a27b72..e8a22bb7 100644
--- a/server/TracyWorker.cpp
+++ b/server/TracyWorker.cpp
@@ -2035,6 +2035,7 @@ std::vector<int16_t> Worker::GetMatchingSourceLocation( const char* query, bool
 #ifndef TRACY_NO_STATISTICS
 const Worker::SourceLocationZones& Worker::GetZonesForSourceLocation( int16_t srcloc ) const
 {
+    assert( AreSourceLocationZonesReady() );
     static const SourceLocationZones empty;
     auto it = m_data.sourceLocationZones.find( srcloc );
     return it != m_data.sourceLocationZones.end() ? it->second : empty;