From a5307c6f5929582dc4ee9e0a8526c9c8e342f1f6 Mon Sep 17 00:00:00 2001
From: Steffen Mauch <steffen.mauch@gmail.com>
Date: Mon, 3 Jan 2022 15:55:57 +0100
Subject: [PATCH] pcbnew: fixing eagle_plugin with empty class names

Fixes #10229
https://gitlab.com/kicad/code/kicad/issues/10229
---
 pcbnew/plugins/eagle/eagle_plugin.cpp | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/pcbnew/plugins/eagle/eagle_plugin.cpp b/pcbnew/plugins/eagle/eagle_plugin.cpp
index a7106d69ed..292ab1d05c 100644
--- a/pcbnew/plugins/eagle/eagle_plugin.cpp
+++ b/pcbnew/plugins/eagle/eagle_plugin.cpp
@@ -2484,17 +2484,20 @@ void EAGLE_PLUGIN::loadClasses( wxXmlNode* aClasses )
     {
         for( std::pair<const wxString&, ECOORD> entry : eClass.clearanceMap )
         {
-            wxString rule;
-            rule.Printf( "(rule \"class %s:%s\"\n"
-                         "  (condition \"A.NetClass == '%s' && B.NetClass == '%s'\")\n"
-                         "  (constraint clearance (min %smm)))\n",
-                         eClass.number,
-                         entry.first,
-                         eClass.name,
-                         m_classMap[ entry.first ]->GetName(),
-                         StringFromValue( EDA_UNITS::MILLIMETRES, entry.second.ToPcbUnits() ) );
+            if( m_classMap[ entry.first ] != nullptr )
+            {
+                wxString rule;
+                rule.Printf( "(rule \"class %s:%s\"\n"
+                             "  (condition \"A.NetClass == '%s' && B.NetClass == '%s'\")\n"
+                             "  (constraint clearance (min %smm)))\n",
+                             eClass.number,
+                             entry.first,
+                             eClass.name,
+                             m_classMap[ entry.first ]->GetName(),
+                             StringFromValue( EDA_UNITS::MILLIMETRES, entry.second.ToPcbUnits() ) );
 
-            m_customRules += "\n" + rule;
+                m_customRules += "\n" + rule;
+            }
         }
     }