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7 changes: 4 additions & 3 deletions Intento.MT.Plugin.PropertiesForm/States/ProviderState.cs
Original file line number Diff line number Diff line change
Expand Up @@ -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);
}

Expand Down Expand Up @@ -440,4 +441,4 @@ public void SetLanguageComboBoxes(string from, string to)

#endregion methods for managing a group of controls
}
}
}