diff --git a/CliClient/tests/services_ResourceService.js b/CliClient/tests/services_ResourceService.js
index 163230292..f861e2807 100644
--- a/CliClient/tests/services_ResourceService.js
+++ b/CliClient/tests/services_ResourceService.js
@@ -96,4 +96,14 @@ describe('services_ResourceService', function() {
 		expect(!!(await Resource.load(resource1.id))).toBe(true);
 	}));
 
+	it('should not delete a resource that has never been associated with any note, because it probably means the resource came via sync, and associated note has not arrived yet', asyncTest(async () => {
+		const service = new ResourceService();
+		const resource = await shim.createResourceFromPath(__dirname + '/../tests/support/photo.jpg');
+
+		await service.indexNoteResources();
+		await service.deleteOrphanResources(0);
+
+		expect((await Resource.all()).length).toBe(1);
+	}));
+
 });
\ No newline at end of file
diff --git a/ReactNativeClient/lib/models/NoteResource.js b/ReactNativeClient/lib/models/NoteResource.js
index 721236089..1e2cfb9aa 100644
--- a/ReactNativeClient/lib/models/NoteResource.js
+++ b/ReactNativeClient/lib/models/NoteResource.js
@@ -1,5 +1,10 @@
 const BaseModel = require('lib/BaseModel.js');
 
+// - If is_associated = 1, note_resources indicates which note_id is currently associated with the given resource_id
+// - If is_associated = 0, note_resources indicates which note_id *was* associated with the given resource_id
+// - last_seen_time tells the last time that reosurce was associated with this note.
+// - If last_seen_time is 0, it means the resource has never been associated with any note.
+
 class NoteResource extends BaseModel {
 
 	static tableName() {
@@ -39,7 +44,7 @@ class NoteResource extends BaseModel {
 		const queries = [];
 		for (let i = 0; i < missingResources.length; i++) {
 			const id = missingResources[i].id;
-			queries.push({ sql: 'INSERT INTO note_resources (note_id, resource_id, is_associated, last_seen_time) VALUES (?, ?, ?, ?)', params: ["", id, 0, Date.now()] });			
+			queries.push({ sql: 'INSERT INTO note_resources (note_id, resource_id, is_associated, last_seen_time) VALUES (?, ?, ?, ?)', params: ["", id, 0, 0] });			
 		}
 		await this.db().transactionExecBatch(queries);
 	}
@@ -57,6 +62,7 @@ class NoteResource extends BaseModel {
 			GROUP BY resource_id
 			HAVING sum(is_associated) <= 0
 			AND last_seen_time < ?
+			AND last_seen_time != 0
 		`, [cutOffTime]);
 		return output.map(r => r.resource_id);
 	}