diff --git a/js/script.js b/js/script.js
index 1847229..06dcdf2 100644
--- a/js/script.js
+++ b/js/script.js
@@ -189,7 +189,7 @@ View.prototype = {
         this._editableColor(note.color);
         this._editableShares(note.shared_with, note.shared_by);
         this._editableTags(note.tags);
-        this._editableAttachts(note.attachts);
+        this._editableAttachts(note.attachts, !note.is_shared);
 
         // Create medium div editor.
         this._isEditable(!note.is_shared);
@@ -507,7 +507,7 @@ View.prototype = {
                         preview_url: OC.generateUrl('core') + '/preview.png?file=' + encodeURI(datapath) + '&x=512&y=512',
                         redirect_url: OC.generateUrl('/apps/files/?dir={dir}&scrollto={scrollto}', {dir: fileInfo.path, scrollto: fileInfo.name})
                     });
-                    self._editableAttachts(attachts);
+                    self._editableAttachts(attachts, true);
                 }).fail(() => {
                     console.log("ERRORRR");
                 });
@@ -798,7 +798,7 @@ View.prototype = {
             $("#modal-note-div .note-tags").replaceWith(html);
         }
     },
-    _editableAttachts: function(attachts) {
+    _editableAttachts: function(attachts, can_delete) {
         if (attachts === undefined) {
             return $("#modal-note-div .note-attach").toArray().map(function (value) {
                 return {
@@ -808,7 +808,7 @@ View.prototype = {
                 };
             });
         } else {
-            var html = Handlebars.templates['attachts']({ attachts: attachts});
+            var html = Handlebars.templates['attachts']({ attachts: attachts, can_delete: can_delete});
             $("#modal-note-div .note-attachts").replaceWith(html);
 
             lozad('.attach-preview').observe();
diff --git a/js/templates/attachts.handlebars b/js/templates/attachts.handlebars
index d1f1b90..63d04d3 100644
--- a/js/templates/attachts.handlebars
+++ b/js/templates/attachts.handlebars
@@ -4,7 +4,9 @@
 			<a target="_blank" href="{{redirect_url}}">
 				<div class="attach-preview note-attach" attach-file-id="{{file_id}}" data-background-image="{{preview_url}}"/>
 			</a>
-			<div class="attach-remove icon-delete" title="{{t "quicknotes" "Delete attachment"}}"/>
+			{{#if ../can_delete}}
+				<div class="attach-remove icon-delete" title="{{t "quicknotes" "Delete attachment"}}"/>
+			{{/if}}
 		</div>
 	{{/each}}
 </div>
\ No newline at end of file
diff --git a/lib/Db/AttachMapper.php b/lib/Db/AttachMapper.php
index 9fa896a..158b085 100644
--- a/lib/Db/AttachMapper.php
+++ b/lib/Db/AttachMapper.php
@@ -73,8 +73,7 @@ class AttachMapper extends QBMapper {
 	 * @param string $userId
 	 * @param int $noteId
 	 * @throws \OCP\AppFramework\Db\DoesNotExistException if not found
-	 * @throws \OCP\AppFramework\Db\MultipleObjectsReturnedException if more than one result
-	 * @return Note[]
+	 * @return Attach[]
 	 */
 	public function findFromNote($userId, $noteId) {
 		$qb = $this->db->getQueryBuilder();
@@ -86,4 +85,5 @@ class AttachMapper extends QBMapper {
 			);
 		return $this->findEntities($qb);
 	}
+
 }
diff --git a/lib/Service/FileService.php b/lib/Service/FileService.php
index c2dbc06..6123392 100644
--- a/lib/Service/FileService.php
+++ b/lib/Service/FileService.php
@@ -57,13 +57,16 @@ class FileService {
 	 * @param int $fileId file id to show
 	 * @param int $sideSize side lenght to show
 	 */
-	public function getPreviewUrl(int $fileId, int $sideSize): string {
+	public function getPreviewUrl(int $fileId, int $sideSize): ?string {
 		$userFolder = $this->rootFolder->getUserFolder($this->userId);
-		$node = current($userFolder->getById($fileId));
-		$path = $userFolder->getRelativePath($node->getPath());
+		$file = current($userFolder->getById($fileId));
+
+		if (!($file instanceof File)) {
+			return null;
+		}
 
 		return $this->urlGenerator->linkToRouteAbsolute('core.Preview.getPreview', [
-			'file' => $path,
+			'file' => $userFolder->getRelativePath($file->getPath()),
 			'x' => $sideSize,
 			'y' => $sideSize
 		]);
@@ -78,7 +81,7 @@ class FileService {
 		$userFolder = $this->rootFolder->getUserFolder($this->userId);
 		$file = current($userFolder->getById($fileId));
 
-		if(!($file instanceof File)) {
+		if (!($file instanceof File)) {
 			return null;
 		}
 
diff --git a/lib/Service/NoteService.php b/lib/Service/NoteService.php
index 2bb9645..14c4b5f 100644
--- a/lib/Service/NoteService.php
+++ b/lib/Service/NoteService.php
@@ -114,12 +114,23 @@ class NoteService {
 
 		// Insert attachts to response.
 		foreach ($notes as $note) {
-			$attachts = $this->attachMapper->findFromNote($userId, $note->getId());
+			$rAttachts = [];
+			$attachts = $this->attachMapper->findFromNote($note->getUserId(), $note->getId());
 			foreach ($attachts as $attach) {
-				$attach->setPreviewUrl($this->fileService->getPreviewUrl($attach->getFileId(), 512));
-				$attach->setRedirectUrl($this->fileService->getRedirectToFileUrl($attach->getFileId()));
+				$previewUrl = $this->fileService->getPreviewUrl($attach->getFileId(), 512);
+				if (is_null($previewUrl))
+					continue;
+
+				$redirectUrl = $this->fileService->getRedirectToFileUrl($attach->getFileId());
+				if (is_null($redirectUrl))
+					continue;
+
+				$attach->setPreviewUrl($previewUrl);
+				$attach->setRedirectUrl($redirectUrl);
+
+				$rAttachts[] = $attach;
 			}
-			$note->setAttachts($attachts);
+			$note->setAttachts($rAttachts);
 		}
 
 		return $notes;