diff --git a/admin/class-h5p-library-admin.php b/admin/class-h5p-library-admin.php
index 09c2529..a66d38e 100644
--- a/admin/class-h5p-library-admin.php
+++ b/admin/class-h5p-library-admin.php
@@ -201,6 +201,7 @@ private function display_libraries() {
           'numContent' => $contents_count === 0 ? '' : $contents_count,
           'numContentDependencies' => $usage['content'] < 1 ? '' : $usage['content'],
           'numLibraryDependencies' => $usage['libraries'] === 0 ? '' : $usage['libraries'],
+          'hasCircularEditorDepencendy' => $usage['hasCircularEditorDepencendy'],
           'upgradeUrl' => $upgradeUrl,
           'detailsUrl' => admin_url('admin.php?page=h5p_libraries&task=show&id=' . $library->id),
           'deleteUrl' => admin_url('admin.php?page=h5p_libraries&task=delete&id=' . $library->id)
@@ -304,7 +305,8 @@ public function process_libraries() {
 
       // Check if this library can be deleted
       $usage = $interface->getLibraryUsage($library->id, $interface->getNumNotFiltered() ? TRUE : FALSE);
-      if ($usage['content'] !== 0 || $usage['libraries'] !== 0) {
+      $delete_circular_editor_dependency = $usage['hasCircularEditorDepencendy'] && $usage['content'] === 0 && $usage['libraries'] === 1;
+      if (!$delete_circular_editor_dependency && ($usage['content'] !== 0 || $usage['libraries'] !== 0)) {
         H5P_Plugin_Admin::set_error(__('This Library is used by content or other libraries and can therefore not be deleted.', $this->plugin_slug));
         return; // Nope
       }
diff --git a/public/class-h5p-wordpress.php b/public/class-h5p-wordpress.php
index c2f01f6..c186ea5 100644
--- a/public/class-h5p-wordpress.php
+++ b/public/class-h5p-wordpress.php
@@ -197,6 +197,34 @@ public function mayUpdateLibraries() {
   public function getLibraryUsage($id, $skipContent = FALSE) {
     global $wpdb;
 
+    /*
+     * There may be direct circular dependencies between a content type and its
+     * editor that might lead to a library not being deletable. Check all
+     * editor dependencies for only having a dependency to the library itself.
+     * No check vice versa, because deleting the editor for a content type
+     * would still allow to choose the content from the H5P Hub with the editor
+     * widget then missing.
+     */
+    $editor_dependencies = $wpdb->get_col($wpdb->prepare(
+      "SELECT required_library_id
+      FROM {$wpdb->prefix}h5p_libraries_libraries
+      WHERE library_id = %d AND dependency_type = %s",
+      $id, 'editor'
+    ));
+
+    $hasCircularEditorDependency = array_reduce($editor_dependencies, function ($isCircle, $editor_library_id) use ($id, $wpdb) {
+      if ($isCircle) {
+        return TRUE; // Found already
+      }
+
+      return (intval($wpdb->get_var($wpdb->prepare(
+        "SELECT COUNT(*)
+        FROM {$wpdb->prefix}h5p_libraries_libraries
+        WHERE library_id = %d AND required_library_id = %d AND dependency_type = %s",
+        intval($editor_library_id), $id, 'preloaded'
+      ))) === 1);
+    }, FALSE);
+
     return array(
       'content' => $skipContent ? -1 : intval($wpdb->get_var($wpdb->prepare(
           "SELECT COUNT(distinct c.id)
@@ -211,7 +239,8 @@ public function getLibraryUsage($id, $skipContent = FALSE) {
           FROM {$wpdb->prefix}h5p_libraries_libraries
           WHERE required_library_id = %d",
           $id)
-        ))
+        )),
+      'hasCircularEditorDepencendy' => $hasCircularEditorDependency
     );
   }