From c21f3f06ff39197ca5091a23ef1c24ff23a0242d Mon Sep 17 00:00:00 2001
From: Dimitri Fontaine <dim@tapoueh.org>
Date: Sat, 24 May 2014 00:03:41 +0200
Subject: [PATCH] Retain NULL tinyints in tinyint-to-boolean, fix #65.

---
 src/transforms.lisp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/transforms.lisp b/src/transforms.lisp
index e3669a0..6711af1 100644
--- a/src/transforms.lisp
+++ b/src/transforms.lisp
@@ -97,7 +97,8 @@
   "When using MySQL, strange things will happen, like encoding booleans into
    tinyiny that are either 0 (false) or 1 (true). Of course PostgreSQL wants
    'f' and 't', respectively."
-  (if (string= "0" integer-string) "f" "t"))
+  (when integer-string
+   (if (string= "0" integer-string) "f" "t")))
 
 (defun int-to-ip (int)
   "Transform an IP as integer into its dotted notation, optimised code from