diff --git a/tests/lib/SystemTag/SystemTagManagerTest.php b/tests/lib/SystemTag/SystemTagManagerTest.php
index e697e37346..61fac99ca6 100644
--- a/tests/lib/SystemTag/SystemTagManagerTest.php
+++ b/tests/lib/SystemTag/SystemTagManagerTest.php
@@ -516,6 +516,15 @@ class SystemTagManagerTest extends TestCase {
 		$this->assertEquals([], $this->tagManager->getTagGroups($tag2));
 	}
 
+	/**
+	 * empty groupIds should be ignored
+	 */
+	public function testEmptyTagGroup() {
+		$tag1 = $this->tagManager->createTag('tag1', true, false);
+		$this->tagManager->setTagGroups($tag1, ['']);
+		$this->assertEquals([], $this->tagManager->getTagGroups($tag1));
+	}
+
 	/**
 	 * @param ISystemTag $tag1
 	 * @param ISystemTag $tag2