X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/6164d85e896743b16a0cf8b0610f5d17ceb47f36..9a29912f608e082001ee53b9873323c4bcd71f21:/include/wx/confbase.h

diff --git a/include/wx/confbase.h b/include/wx/confbase.h
index 2ce903fec7..3c4773b05a 100644
--- a/include/wx/confbase.h
+++ b/include/wx/confbase.h
@@ -76,7 +76,7 @@ extern wxString wxExpandEnvVars(const wxString &sz);
 extern void wxSplitPath(wxArrayString& aParts, const char *sz);
 
 // ----------------------------------------------------------------------------
-// abstract base class wxConfigBase which defines the interface for derived 
+// abstract base class wxConfigBase which defines the interface for derived
 // classes
 //
 // wxConfig organizes the items in a tree-like structure (modeled after the
@@ -222,14 +222,18 @@ public:
 
 protected:
   static bool IsImmutable(const wxString& key)
-    { return key[0] == wxCONFIG_IMMUTABLE_PREFIX; }
+  #ifndef __WXMAC__
+    { return !key.IsEmpty() && key[0u] == wxCONFIG_IMMUTABLE_PREFIX; }
+  #else
+    { return !key.IsEmpty() && key[0ul] == wxCONFIG_IMMUTABLE_PREFIX; }
+  #endif
 
 private:
   // are we doing automatic environment variable expansion?
   bool m_bExpandEnvVars;
   // do we record default values?
   bool m_bRecordDefaults;
-  
+
   // static variables
   static wxConfigBase *ms_pConfig;
   static bool          ms_bAutoCreate;