fix: Fix psalm error

Signed-off-by: Joas Schilling <[email protected]>

Author: nickvergessen

lib/Operation.php

@@ -73,7 +73,7 @@ public function checkFileAccess(IStorage $storage, string $path, bool $isDir = f
 		$this->nestingLevel--;
 
 		if (!empty($match)) {
-			$e = new \RuntimeException('Access denied for path ' . $path . ' that is ' . ($isDir ? '' : 'not ') . 'a directory and matches rules: ' . json_encode($match));
+			$e = new \RuntimeException('Access denied for path ' . $path . ' that is ' . ($isDir ? '' : 'not ') . 'a directory and matches rules: ' . (string)json_encode($match));
 			$this->logger->debug($e->getMessage(), ['exception' => $e]);
 			// All Checks of one operation matched: prevent access
 			throw new ForbiddenException('Access denied by access control', false);