* Fix bug #14439.

module/doc/model.php

@@ -2310,7 +2310,7 @@ EOT;
         {
             $libs = $this->getLibsByObject('book', 0, '', $appendLib);
             $this->app->rawMethod = 'book';
-            if($libID == 0 and !empty($libs)) $libID = reset($libs)->id;
+            if(!empty($libs) and ($libID == 0 or !isset($libs[$libID]))) $libID = reset($libs)->id;
             $this->lang->modulePageNav = $this->select($type, $objects, $objectID, $libs, $libID);
 
             $object = new stdclass();

module/doc/view/tablecontents.html.php

@@ -52,7 +52,7 @@ if(empty($type)) $type = 'product';
           echo '</ul></div>';
       }
 
-      if($type == 'book' and ($canEditLib or $canManageBook))
+      if($type == 'book' and ($canEditLib or $canManageBook) and !empty($libs))
       {
           echo "<div class='menu-actions'>";
           echo html::a('javascript:;', "<i class='icon icon-ellipsis-v'></i>", '', "data-toggle='dropdown' class='btn btn-link'");