diff --git a/Intento.MT.Plugin.PropertiesForm/States/ProviderState.cs b/Intento.MT.Plugin.PropertiesForm/States/ProviderState.cs
index b919c4d..b76c3df 100644
--- a/Intento.MT.Plugin.PropertiesForm/States/ProviderState.cs
+++ b/Intento.MT.Plugin.PropertiesForm/States/ProviderState.cs
@@ -258,12 +258,13 @@ public AuthState GetAuthState()
 
         private static bool ProviderSupportsPair(Provider provider, LangPair pair)
         {
-            if (provider.Pairs.Any(p => p.From == pair.From && p.To == pair.To))
+            if (provider.Pairs != null && provider.Pairs.Any(p => p.From == pair.From && p.To == pair.To))
             {
                 return true;
             }
 
-            return provider.Symmetric.Any(x => x == pair.From) &&
+            return provider.Symmetric != null &&
+                   provider.Symmetric.Any(x => x == pair.From) &&
                    provider.Symmetric.Any(x => x == pair.To);
         }
 
@@ -440,4 +441,4 @@ public void SetLanguageComboBoxes(string from, string to)
 
         #endregion methods for managing a group of controls
     }
-}
\ No newline at end of file
+}