diff --git a/app/Repos/EntityRepo.php b/app/Repos/EntityRepo.php
index f1428735c..8a8740d76 100644
--- a/app/Repos/EntityRepo.php
+++ b/app/Repos/EntityRepo.php
@@ -332,12 +332,12 @@ class EntityRepo
                 $parents[$key] = $entities[$index];
                 $parents[$key]->setAttribute('pages', collect());
             }
-            if ($entities[$index]->chapter_id === 0) $tree[] = $entities[$index];
+            if ($entities[$index]->chapter_id === 0 || $entities[$index]->chapter_id === '0') $tree[] = $entities[$index];
             $entities[$index]->book = $book;
         }
 
         foreach ($entities as $entity) {
-            if ($entity->chapter_id === 0) continue;
+            if ($entity->chapter_id === 0 || $entity->chapter_id === '0') continue;
             $parentKey = 'BookStack\\Chapter:' . $entity->chapter_id;
             $chapter = $parents[$parentKey];
             $chapter->pages->push($entity);
diff --git a/app/User.php b/app/User.php
index afcd9af70..8033557e4 100644
--- a/app/User.php
+++ b/app/User.php
@@ -165,7 +165,7 @@ class User extends Model implements AuthenticatableContract, CanResetPasswordCon
         if ($imageId === 0 || $imageId === '0' || $imageId === null) return $default;
 
         try {
-            $avatar = baseUrl($this->avatar->getThumb($size, $size, false));
+            $avatar = $this->avatar ? baseUrl($this->avatar->getThumb($size, $size, false)) : $default;
         } catch (\Exception $err) {
             $avatar = $default;
         }
diff --git a/composer.json b/composer.json
index c0543a4ca..f0cf9c4ae 100644
--- a/composer.json
+++ b/composer.json
@@ -49,7 +49,9 @@
         ],
         "post-install-cmd": [
             "Illuminate\\Foundation\\ComposerScripts::postInstall",
-            "php artisan optimize"
+            "php artisan optimize",
+            "php artisan cache:clear",
+            "php artisan view:clear"
         ],
         "post-update-cmd": [
             "Illuminate\\Foundation\\ComposerScripts::postUpdate",
diff --git a/resources/assets/sass/_text.scss b/resources/assets/sass/_text.scss
index 74eb6875a..aac4298ea 100644
--- a/resources/assets/sass/_text.scss
+++ b/resources/assets/sass/_text.scss
@@ -119,6 +119,11 @@ sup, .superscript {
   font-size: 0.8em;
 }
 
+sub, .subscript {
+  vertical-align: sub;
+  font-size: 0.8em;
+}
+
 pre {
   font-family: monospace;
   white-space:pre;