From 5b4b620d8b2a36f5e76ffbca16a2d3d5d7253c45 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Sat, 6 May 2017 17:47:08 +0100
Subject: Do not crash on AST if parsing failed

---
 libsolidity/interface/CompilerStack.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index 9c9c9614..c4e60fd7 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -503,6 +503,9 @@ Scanner const& CompilerStack::scanner(string const& _sourceName) const
 
 SourceUnit const& CompilerStack::ast(string const& _sourceName) const
 {
+	if (m_stackState < ParsingSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Parsing was not successful."));
+
 	return *source(_sourceName).ast;
 }
 
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