diff --git a/neil b/neil
index 27a522b..2cee717 100755
--- a/neil
+++ b/neil
@@ -1236,10 +1236,12 @@ chmod +x bin/kaocha
                      [v :mvn])
                    (when-let [v (latest-mvn-version lib)]
                      [v :mvn])))
+            _ (when-not version
+                (throw (ex-info (str "Couldn't find version for lib: " lib) {:babashka/exit 0})))
             missing? (nil? version)
-            mvn? (= coord-type? :mvn)
-            git-sha? (= coord-type? :git/sha)
-            git-tag? (= coord-type? :git/tag)
+            mvn? (= :mvn coord-type?)
+            git-sha? (= :git/sha coord-type?)
+            git-tag? (= :git/tag coord-type?)
             git-url (when (or git-sha? git-tag?)
                       (or (:git/url opts)
                           (str "https://github.com/" (git/clean-github-lib lib))))
diff --git a/src/babashka/neil.clj b/src/babashka/neil.clj
index 2595d63..7018d2f 100644
--- a/src/babashka/neil.clj
+++ b/src/babashka/neil.clj
@@ -378,10 +378,12 @@ chmod +x bin/kaocha
                      [v :mvn])
                    (when-let [v (latest-mvn-version lib)]
                      [v :mvn])))
+            _ (when-not version
+                (throw (ex-info (str "Couldn't find version for lib: " lib) {:babashka/exit 0})))
             missing? (nil? version)
-            mvn? (= coord-type? :mvn)
-            git-sha? (= coord-type? :git/sha)
-            git-tag? (= coord-type? :git/tag)
+            mvn? (= :mvn coord-type?)
+            git-sha? (= :git/sha coord-type?)
+            git-tag? (= :git/tag coord-type?)
             git-url (when (or git-sha? git-tag?)
                       (or (:git/url opts)
                           (str "https://github.com/" (git/clean-github-lib lib))))
diff --git a/tests.clj b/tests.clj
index f83be44..649ca18 100644
--- a/tests.clj
+++ b/tests.clj
@@ -25,7 +25,8 @@
   (let [{:keys [edn]} (neil "add dep clj-kondo/clj-kondo")]
     (is (-> edn :deps (get 'clj-kondo/clj-kondo))))
   (let [{:keys [edn]} (neil "add dep clj-kondo")]
-    (is (-> edn :deps (get 'clj-kondo/clj-kondo)))))
+    (is (-> edn :deps (get 'clj-kondo/clj-kondo))))
+  (is (thrown? Exception (neil "add dep fake-dep"))))
 
 (deftest add-dep-alias-test
   (let [{:keys [edn]} (neil "add dep clj-kondo/clj-kondo" :alias :lint)]