Merge pull request #26272 from nextcloud/backport/26270/stable20

[stable20] Catch invalid cache source storage path

Author: MorrisJobke

lib/private/Files/Cache/Cache.php

@@ -627,6 +627,10 @@ public function moveFromCache(ICache $sourceCache, $sourcePath, $targetPath) {
 			$targetPath = $this->normalize($targetPath);
 
 			$sourceData = $sourceCache->get($sourcePath);
+			if ($sourceData === false) {
+				throw new \Exception('Invalid source storage path: ' . $sourcePath);
+			}
+
 			$sourceId = $sourceData['fileid'];
 			$newParentId = $this->getParentId($targetPath);