diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,5 @@
+1.0.4
+* Default auth id to NULL to fix a MySQL bug.
 1.0.3
 * Get building on ghc-8
 * Limit column size for session key
diff --git a/serversession-backend-persistent.cabal b/serversession-backend-persistent.cabal
--- a/serversession-backend-persistent.cabal
+++ b/serversession-backend-persistent.cabal
@@ -1,9 +1,9 @@
 name:            serversession-backend-persistent
-version:         1.0.3
+version:         1.0.4
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa <felipe.lessa@gmail.com>
-maintainer:      Felipe Lessa <felipe.lessa@gmail.com>
+maintainer:      Michael Xavier <michael@michaelxavier.net>
 synopsis:        Storage backend for serversession using persistent and an RDBMS.
 category:        Web
 stability:       Stable
diff --git a/src/Web/ServerSession/Backend/Persistent/Internal/Impl.hs b/src/Web/ServerSession/Backend/Persistent/Internal/Impl.hs
--- a/src/Web/ServerSession/Backend/Persistent/Internal/Impl.hs
+++ b/src/Web/ServerSession/Backend/Persistent/Internal/Impl.hs
@@ -159,7 +159,7 @@
         (P.DBName "auth_id")
         (P.FTTypeCon Nothing "ByteStringJ")
         (P.sqlType (Proxy :: Proxy ByteStringJ))
-        ["Maybe"]
+        ["Maybe", "default=NULL"]
         True
         P.NoReference
   persistFieldDef PersistentSessionSession