diff --git a/src/common/intl.cpp b/src/common/intl.cpp
index d9f4718c3e..88ee2e0bfe 100644
--- a/src/common/intl.cpp
+++ b/src/common/intl.cpp
@@ -952,6 +952,9 @@ const wxLanguageInfo *wxLocale::GetLanguageInfo(int lang)
     if ( lang == wxLANGUAGE_DEFAULT )
         lang = GetSystemLanguage();
 
+    if ( lang == wxLANGUAGE_UNKNOWN )
+        return NULL;
+
     const size_t count = ms_languagesDB->GetCount();
     for ( size_t i = 0; i < count; i++ )
     {