readBytes() never returns null

1 files changed, 2 insertions, 2 deletions

diff --git a/program/lib/Roundcube/rcube_imap_generic.php b/program/lib/Roundcube/rcube_imap_generic.php
index 7312a6898..4f2cdacc5 100644
--- a/program/lib/Roundcube/rcube_imap_generic.php
+++ b/program/lib/Roundcube/rcube_imap_generic.php
@@ -246,7 +246,7 @@ class rcube_imap_generic
 
             while (strlen($out) < $bytes) {
                 $out = $this->readBytes($bytes);
-                if ($out === null) {
+                if ($out === '') {
                     break;
                 }
 
@@ -278,7 +278,7 @@ class rcube_imap_generic
 
             while (strlen($out) < $bytes) {
                 $line = $this->readBytes($bytes);
-                if ($line === null) {
+                if ($line === '') {
                     break;
                 }