From ae7e8fd1e5509c0da4d807867c02a26ad026f801 Mon Sep 17 00:00:00 2001
From: Jackson Schuster <36744439+jtschuster@users.noreply.github.com>
Date: Tue, 27 Sep 2022 11:26:10 -0500
Subject: Check for nulls in
 IsInterfaceImplementationNeededByTypeDueToInterface (#3050)

---
 src/linker/Linker.Steps/MarkStep.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/linker/Linker.Steps/MarkStep.cs b/src/linker/Linker.Steps/MarkStep.cs
index dc026e7b9..5d4065d35 100644
--- a/src/linker/Linker.Steps/MarkStep.cs
+++ b/src/linker/Linker.Steps/MarkStep.cs
@@ -611,7 +611,7 @@ namespace Mono.Linker.Steps
 						if (bases is null)
 							continue;
 						foreach (var @base in bases) {
-							if (@base.DeclaringType.IsInterface && IgnoreScope (@base.DeclaringType.Scope))
+							if (@base.DeclaringType is not null && @base.DeclaringType.IsInterface && IgnoreScope (@base.DeclaringType.Scope))
 								_interfaceOverrides.Add ((new OverrideInformation (@base, method, Context), ScopeStack.CurrentScope));
 						}
 					}
@@ -2406,6 +2406,9 @@ namespace Mono.Linker.Steps
 		{
 			var @base = overrideInformation.Base;
 			var method = overrideInformation.Override;
+			if (@base is null || method is null || @base.DeclaringType is null)
+				return false;
+
 			if (Annotations.IsMarked (method))
 				return false;
 
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