diff --git a/eeschema/netlist_exporters/netlist_exporter_allegro.cpp b/eeschema/netlist_exporters/netlist_exporter_allegro.cpp
index 3383c7034a..3083e2d35b 100644
--- a/eeschema/netlist_exporters/netlist_exporter_allegro.cpp
+++ b/eeschema/netlist_exporters/netlist_exporter_allegro.cpp
@@ -421,7 +421,7 @@ void NETLIST_EXPORTER_ALLEGRO::toAllegroPackages()
         wxArrayString footprintAlt;
         wxArrayString footprintArray = sym->GetLibSymbolRef()->GetFPFilters();
 
-        for( auto fp : footprintArray )
+        for( const wxString& fp : footprintArray )
         {
             if( ( fp.Find( '*' ) != wxNOT_FOUND ) || ( fp.Find( '?' ) != wxNOT_FOUND ) )
             {
@@ -491,10 +491,12 @@ void NETLIST_EXPORTER_ALLEGRO::toAllegroPackages()
             fprintf( d, "PACKAGEPROP ALT_SYMBOLS '(" );
 
             wxString footprintAltSymbolsText;
-            for( auto fp : footprintAlt )
+
+            for( const wxString& fp : footprintAlt )
             {
                 footprintAltSymbolsText += fp + wxString( "," );
             }
+
             footprintAltSymbolsText.Truncate( footprintAltSymbolsText.Length() - 1 );
             fprintf( d, "%s)'\n", TO_UTF8( footprintAltSymbolsText ) );
         }
@@ -609,7 +611,7 @@ wxString NETLIST_EXPORTER_ALLEGRO::formatFunction( wxString aName, LIB_PINS aPin
 
     out_str.Printf( wxT( "PINORDER %s " ), TO_UTF8( aName ) );
 
-    for( wxString& pinName : pinNameList )
+    for( const wxString& pinName : pinNameList )
     {
         str.Printf( ",\n\t%s", TO_UTF8( pinName ) );
         out_str += str;
@@ -640,7 +642,7 @@ wxString NETLIST_EXPORTER_ALLEGRO::getGroupField( int aGroupIndex, const wxArray
         SCH_SYMBOL* sym = ( iter->second ).first;
         SCH_SHEET_PATH sheetPath = ( iter->second ).second;
 
-        for( auto field : aFieldArray )
+        for( const wxString& field : aFieldArray )
         {
             SCH_FIELD* fld = sym->FindField( field, true, true );
 
@@ -666,7 +668,7 @@ wxString NETLIST_EXPORTER_ALLEGRO::getGroupField( int aGroupIndex, const wxArray
     {
         SCH_SYMBOL* sym = ( iter->second ).first;
 
-        for( auto field : aFieldArray )
+        for( const wxString& field : aFieldArray )
         {
             LIB_FIELD* fld = sym->GetLibSymbolRef()->FindField( field, true );
 
diff --git a/eeschema/netlist_exporters/netlist_exporter_allegro.h b/eeschema/netlist_exporters/netlist_exporter_allegro.h
index ef15635a9e..7d6e85761a 100644
--- a/eeschema/netlist_exporters/netlist_exporter_allegro.h
+++ b/eeschema/netlist_exporters/netlist_exporter_allegro.h
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 1992-2013 jp.charras at wanadoo.fr
  * Copyright (C) 2013 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
- * Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 1992-2023 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -35,7 +35,8 @@ class NETLIST_EXPORTER_ALLEGRO : public NETLIST_EXPORTER_BASE
 {
 public:
     NETLIST_EXPORTER_ALLEGRO( SCHEMATIC* aSchematic ) :
-            NETLIST_EXPORTER_BASE( aSchematic )
+        NETLIST_EXPORTER_BASE( aSchematic ),
+        m_f( nullptr )
     {
     }
 
@@ -212,4 +213,4 @@ private:
     std::multimap<wxString, NET_NODE> m_netNameNodes;    ///< Store the NET_NODE with the net name
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/kicad/project_tree_pane.cpp b/kicad/project_tree_pane.cpp
index 356fd1d367..da92efd213 100644
--- a/kicad/project_tree_pane.cpp
+++ b/kicad/project_tree_pane.cpp
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
  * Copyright (C) 2012 Jean-Pierre Charras, jp.charras at wanadoo.fr
- * Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 1992-2023 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -242,7 +242,9 @@ void PROJECT_TREE_PANE::onCreateNewDirectory( wxCommandEvent& event )
 
         wxString full_dirname = curr_dir + wxFileName::GetPathSeparator() + new_dir;
 
-        wxMkdir( full_dirname );
+        if( !wxMkdir( full_dirname ) )
+            return;
+
         addItemToProjectTree( full_dirname, item_data->GetId(), nullptr, false );
     }
 }