diff --git a/Mono.Cecil/TypeParser.cs b/Mono.Cecil/TypeParser.cs
index 33ffb60f0..3345aa77e 100644
--- a/Mono.Cecil/TypeParser.cs
+++ b/Mono.Cecil/TypeParser.cs
@@ -390,8 +390,13 @@ static bool TryGetDefinition (ModuleDefinition module, Type type_info, out TypeR
 
 			var nested_names = type_info.nested_names;
 			if (!nested_names.IsNullOrEmpty ()) {
-				for (int i = 0; i < nested_names.Length; i++)
-					typedef = typedef.GetNestedType (nested_names [i]);
+				for (int i = 0; i < nested_names.Length; i++) {
+					var nested_type = typedef.GetNestedType (nested_names [i]);
+					if (nested_type == null)
+						return false;
+
+					typedef = nested_type;
+				}
 			}
 
 			type = typedef;