diff --git a/libtisbackup/backup_rsync_btrfs.py b/libtisbackup/backup_rsync_btrfs.py
index 66b892c..7cf93e9 100644
--- a/libtisbackup/backup_rsync_btrfs.py
+++ b/libtisbackup/backup_rsync_btrfs.py
@@ -200,8 +200,8 @@ class backup_rsync_btrfs(backup_generic):
                     elif (returncode == 23):
                         self.logger.warning("[" + self.backup_name + "] unable so set uid on some files")
                     elif (returncode != 0):
-                        self.logger.error("[" + self.backup_name + "] shell program exited with error code ")
-                        raise Exception("[" + self.backup_name + "] shell program exited with error code " + str(returncode), cmd)
+                        self.logger.error("[" + self.backup_name + "] shell program exited with error code ", str(returncode))
+                        raise Exception("[" + self.backup_name + "] shell program exited with error code " + str(returncode), cmd, log[-512:])
                 else:
                     print cmd