The thermal printer prints garbage before actual picture from time to time

[Selorax]

I have NT-5890K thermal printer and use the driver from here. Sometimes, when printing images from this site it prints garbage.

There was a similar issue #5 but the difference is in my case garbage characters are printed in front of picture and it does not happen every time. Could it be because incorrect handling of blank lines in #44? I didn't encounter this problem after patching the code, but it could happen later.