diff --git a/lib/private/Files/Cache/Propagator.php b/lib/private/Files/Cache/Propagator.php
index b63a41b91d9..77e5ae30746 100644
--- a/lib/private/Files/Cache/Propagator.php
+++ b/lib/private/Files/Cache/Propagator.php
@@ -79,6 +79,10 @@ class Propagator implements IPropagator {
 			}
 		}
 
+		if ($parents === []) {
+			return;
+		}
+
 		if ($this->inBatch) {
 			foreach ($parents as $parent) {
 				$this->addToBatch($parent, $time, $sizeDifference);