diff --git a/src/iced/nrepl/namespace.clj b/src/iced/nrepl/namespace.clj
index 47feb70..f549363 100644
--- a/src/iced/nrepl/namespace.clj
+++ b/src/iced/nrepl/namespace.clj
@@ -17,11 +17,15 @@
 (defmulti aliases (fn [env _] env))
 (defmethod aliases "clj"
   [_ ns-code]
-  (->> ns-code i.u.ns/extract-ns-sym ns-aliases
-       (medley/map-vals ns-name)
-       ensure-string-map))
+  (or (some->> ns-code i.u.ns/extract-ns-sym ns-aliases
+               (medley/map-vals ns-name)
+               ensure-string-map)
+      {}))
 
 (defmethod aliases "cljs"
   [_ ns-code]
-  (-> ns-code read-string r.ns.parser/get-libspecs r.ns.parser/aliases
-      ensure-string-map))
+  (or (when (seq ns-code)
+        (some-> ns-code read-string r.ns.parser/get-libspecs
+                r.ns.parser/aliases
+                ensure-string-map))
+      {}))
diff --git a/test/iced/nrepl/namespace_test.clj b/test/iced/nrepl/namespace_test.clj
index 276f85b..09d5636 100644
--- a/test/iced/nrepl/namespace_test.clj
+++ b/test/iced/nrepl/namespace_test.clj
@@ -22,6 +22,18 @@
               "sut" "iced.nrepl.namespace"}
              (sut/aliases "clj" "(ns iced.nrepl.namespace-test)"))))
 
+  (t/testing "clj with no ns form"
+    (t/is (= {}  (sut/aliases "clj" "(list 1 2 3)"))))
+
+  (t/testing "clj with no ns form"
+    (t/is (= {}  (sut/aliases "clj" ""))))
+
   (t/testing "cljs"
     (t/is (= {"bar" "foo.bar"}
-             (sut/aliases "cljs" "(ns foo.core (:require [foo.bar :as bar]))")))))
+             (sut/aliases "cljs" "(ns foo.core (:require [foo.bar :as bar]))"))))
+
+  (t/testing "cljs with no ns form"
+    (t/is (= {}  (sut/aliases "cljs" "(list 1 2 3)"))))
+
+  (t/testing "cljs with no ns form"
+    (t/is (= {}  (sut/aliases "cljs" "")))))