diff --git a/src/main/frontend/components/sidebar.cljs b/src/main/frontend/components/sidebar.cljs
index a5ee5ae5b2..0f2fad8e2b 100644
--- a/src/main/frontend/components/sidebar.cljs
+++ b/src/main/frontend/components/sidebar.cljs
@@ -86,7 +86,7 @@
   (let [original-name (db-model/get-page-original-name name)]
     [:a {:on-click (fn [e]
                      (util/stop e)
-                     (let [name (string/lower-case name)]
+                     (let [name (util/safe-lower-case name)]
                        (if (gobj/get e "shiftKey")
                          (when-let [page-entity (db/entity [:block/name name])]
                            (state/sidebar-add-block!
@@ -148,7 +148,7 @@
        [:ul.favorites
         (for [name favorites]
           (when-not (string/blank? name)
-            (when (db/entity [:block/name (string/lower-case name)])
+            (when (db/entity [:block/name (util/safe-lower-case name)])
                 (favorite-item t name))))]))))
 
 (rum/defc recent-pages
@@ -167,7 +167,7 @@
                     (filter string?))]
      [:ul
       (for [name pages]
-        (when (db/entity [:block/name (string/lower-case name)])
+        (when (db/entity [:block/name (util/safe-lower-case name)])
           [:li {:key name}
            (page-name name)]))])))
 
@@ -295,7 +295,7 @@
     (let [page (:page default-home)
           page (when (and (string? page)
                           (not (string/blank? page)))
-                 (db/entity [:block/name (string/lower-case page)]))]
+                 (db/entity [:block/name (util/safe-lower-case page)]))]
       (if page
         default-home
         (dissoc default-home :page)))))
@@ -313,7 +313,7 @@
                (when-let [pages (->> (seq sidebar)
                                      (remove string/blank?))]
                  (doseq [page pages]
-                   (let [page (string/lower-case page)
+                   (let [page (util/safe-lower-case page)
                          [db-id block-type] (if (= page "contents")
                                               ["contents" :contents]
                                               [page :page])]
diff --git a/src/main/frontend/util.cljc b/src/main/frontend/util.cljc
index 0f1d8b2cf4..da6a3b4178 100644
--- a/src/main/frontend/util.cljc
+++ b/src/main/frontend/util.cljc
@@ -548,6 +548,11 @@
      (subs s (+ first-index (count pattern)) (count s))]
     [s ""]))
 
+(defn safe-lower-case
+  [s]
+  (if (string? s)
+    (string/lower-case s) s))
+
 (defn split-first [pattern s]
   (when-let [first-index (string/index-of s pattern)]
     [(subs s 0 first-index)