diff --git a/common/src/app/common/time.cljc b/common/src/app/common/time.cljc
index 62f5551589..d32ecfbefe 100644
--- a/common/src/app/common/time.cljc
+++ b/common/src/app/common/time.cljc
@@ -259,6 +259,9 @@
 (defn inst
   [s]
   (cond
+    (nil? s)
+    s
+
     (inst? s)
     s