diff --git a/deps.edn b/deps.edn
index 3d5b17f..8e60042 100644
--- a/deps.edn
+++ b/deps.edn
@@ -9,6 +9,10 @@
                  :extra-paths ["test"]}
            :bench {:extra-deps {seancorfield/next.jdbc {:mvn/version "1.0.1"}
                                 criterium/criterium {:mvn/version "0.4.5"}}}
+
+           :jar {:extra-deps {seancorfield/depstar {:mvn/version "RELEASE"}}
+                 :main-opts ["-m" "hf.depstar.jar"]}
+
            :repl {:main-opts  ["-m" "rebel-readline.main"]}
            :ancient {:main-opts ["-m" "deps-ancient.deps-ancient"]
                      :extra-deps {deps-ancient {:mvn/version "RELEASE"}}}
diff --git a/pom.xml b/pom.xml
index daf4d4f..299f7a2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>funcool</groupId>
   <artifactId>suricatta</artifactId>
   <packaging>jar</packaging>
-  <version>2.0.0</version>
+  <version>2.0.0-SNAPSHOT</version>
   <name>suricatta</name>
   <description>High level sql toolkit for clojure (backed by jooq library)</description>
   <url>https://github.com/funcool/suricatta</url>
diff --git a/src/suricatta/impl.clj b/src/suricatta/impl.clj
index 80a47f0..4fe889d 100644
--- a/src/suricatta/impl.clj
+++ b/src/suricatta/impl.clj
@@ -92,6 +92,9 @@
 
 (extend-protocol proto/IParam
   Object
+  (-param [v _] v)
+
+  nil
   (-param [v _] v))
 
 (defn wrap-if-need
@@ -223,8 +226,12 @@
 ;; Default implementation for avoid call to `satisfies?`
 (extend-protocol proto/ISQLType
   Object
+  (-convert [v] v)
+
+  nil
   (-convert [v] v))
 
+
 (defn- result-record->record
   [^org.jooq.Record record]
   (letfn [(reduce-fn [acc ^Field field]