diff --git a/ILSpy/TreeNodes/Analyzer/AnalyzedTypeExposedByTreeNode.cs b/ILSpy/TreeNodes/Analyzer/AnalyzedTypeExposedByTreeNode.cs
index a5bbda16f..55244fd2b 100644
--- a/ILSpy/TreeNodes/Analyzer/AnalyzedTypeExposedByTreeNode.cs
+++ b/ILSpy/TreeNodes/Analyzer/AnalyzedTypeExposedByTreeNode.cs
@@ -128,7 +128,8 @@ namespace ICSharpCode.ILSpy.TreeNodes.Analyzer
 			if (method.IsPrivate) {
 				if (!method.HasOverrides)
 					return false;
-				else if (!method.Overrides[0].DeclaringType.Resolve().IsInterface)
+				var typeDefinition = method.Overrides[0].DeclaringType.Resolve();
+				if (typeDefinition != null && !typeDefinition.IsInterface)
 					return false;
 			}