Fixed X509Crl.IsDelta for CRLs without extensions (#513)

* Fixed X509Crl.IsDelta for CRLs without extensions GetCriticalExtensionOids returns null for CRLs without any extensions.
jstedfast · Oct 25, 2019 · 85b2e11 · 85b2e11
1 parent ecfcc83
commit 85b2e11
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/MimeKit/Cryptography/BouncyCastleCertificateExtensions.cs b/MimeKit/Cryptography/BouncyCastleCertificateExtensions.cs
@@ -348,7 +348,7 @@ internal static bool IsDelta (this X509Crl crl)
 		{
 			var critical = crl.GetCriticalExtensionOids ();
 
-			return critical.Contains (X509Extensions.DeltaCrlIndicator.Id);
+			return critical != null ? critical.Contains (X509Extensions.DeltaCrlIndicator.Id) : false;
 		}
 	}
 }