From 4abc650ecd14bd31e2aa390b9d9d8193c31c2ab5 Mon Sep 17 00:00:00 2001
From: Daniel Grunwald <daniel@danielgrunwald.de>
Date: Fri, 20 May 2011 21:44:37 +0200
Subject: [PATCH] Fix NullReferenceException in TrransformSwitchOnString.
 Closes #95.

---
 .../Ast/Transforms/PatternStatementTransform.cs                 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ICSharpCode.Decompiler/Ast/Transforms/PatternStatementTransform.cs b/ICSharpCode.Decompiler/Ast/Transforms/PatternStatementTransform.cs
index bc17d13cc..6c34b1b4f 100644
--- a/ICSharpCode.Decompiler/Ast/Transforms/PatternStatementTransform.cs
+++ b/ICSharpCode.Decompiler/Ast/Transforms/PatternStatementTransform.cs
@@ -648,7 +648,7 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 			// switchVar must be the same as switchExpr; or switchExpr must be an assignment and switchVar the left side of that assignment
 			if (!m.Get("switchVar").Single().IsMatch(m.Get("switchExpr").Single())) {
 				AssignmentExpression assign = m.Get("switchExpr").Single() as AssignmentExpression;
-				if (!m.Get("switchVar").Single().IsMatch(assign.Left))
+				if (!(assign != null && m.Get("switchVar").Single().IsMatch(assign.Left)))
 					return null;
 			}
 			FieldReference cachedDictField = m.Get<AstNode>("cachedDict").Single().Annotation<FieldReference>();