diff --git a/classes/file/FileHandler.class.php b/classes/file/FileHandler.class.php
index 7bf59e4b8..aa5f6aaba 100644
--- a/classes/file/FileHandler.class.php
+++ b/classes/file/FileHandler.class.php
@@ -467,7 +467,7 @@ class FileHandler
 	{
 		$K64 = 65536;
 		$TWEAKFACTOR = 2.0;
-		$channels = $imageInfo['channels'];
+		$channels = $imageInfo['channels'] ?? 6;
 		if(!$channels)
 		{
 			$channels = 6; //for png