diff --git a/Lexer.Tests/MLexerShould.cs b/Lexer.Tests/MLexerShould.cs
index 8e99e3d..28fd34e 100644
--- a/Lexer.Tests/MLexerShould.cs
+++ b/Lexer.Tests/MLexerShould.cs
@@ -205,5 +205,15 @@ namespace Parser.Tests
             var actual = string.Join("", tokens.Select(token => token.FullText));
             Assert.AreEqual(s, actual);
         }
+
+        [Test]
+        public void ParseStringLiteral()
+        {
+            var sut = CreateLexer("'just a string'");
+            var tokens = sut.ParseAll();
+            Assert.AreEqual(2, tokens.Count);
+            Assert.AreEqual(TokenKind.StringLiteral, tokens[0].Kind);
+            Assert.AreEqual("just a string", tokens[0].PureToken.Value);
+        }
     }
 }
\ No newline at end of file
diff --git a/Lexer/MLexer.cs b/Lexer/MLexer.cs
index eed2c4e..93af021 100644
--- a/Lexer/MLexer.cs
+++ b/Lexer/MLexer.cs
@@ -537,10 +537,11 @@ namespace Lexer
                     Window.ConsumeChar();
                     return PureTokenFactory.CreatePunctuation(TokenKind.QuestionMark);
                 case '\'':
-                    if (LastToken.PureToken.Kind == TokenKind.ClosingBrace
-                        || LastToken.PureToken.Kind == TokenKind.ClosingBracket
-                        || LastToken.PureToken.Kind == TokenKind.ClosingSquareBracket
-                        || LastToken.PureToken.Kind == TokenKind.Identifier)
+                    if (LastToken != null &&
+                        (LastToken.Kind == TokenKind.ClosingBrace
+                        || LastToken.Kind == TokenKind.ClosingBracket
+                        || LastToken.Kind == TokenKind.ClosingSquareBracket
+                        || LastToken.Kind == TokenKind.Identifier))
                     {
                         if (LastToken.TrailingTrivia.Count == 0 && leadingTrivia.Count == 0)
                         {