Fixed a missing self.buffer()
Fixed a missing self.buffer()

(cherry picked from commit 0fa22937e01f7836247eca50bbac3b910d83b2a8)

ryanneufeld/OctoPrint,foosel/OctoPrint,shaggythesheep/OctoPrint,Javierma/OctoPrint-TFG,chriskoz/OctoPrint,leductan-nguyen/RaionPi,JackGavin13/octoprint-test-not-finished,MaxOLydian/OctoPrint,masterhou/OctoPrint,chriskoz/OctoPrint,JackGavin13/octoprint-test-not-finished,Salandora/OctoPrint,alex1818/OctoPrint,JackGavin13/octoprint-test-not-finished,EZ3-India/EZ-Remote,alex1818/OctoPrint,eddieparker/OctoPrint,SeveQ/OctoPrint,nickverschoor/OctoPrint,Salandora/OctoPrint,eddieparker/OctoPrint,uuv/OctoPrint,punkkeks/OctoPrint,shohei/Octoprint,leductan-nguyen/RaionPi,Javierma/OctoPrint-TFG,beeverycreative/BEEweb,MoonshineSG/OctoPrint,beeverycreative/BEEweb,uuv/OctoPrint,SeveQ/OctoPrint,mcanes/OctoPrint,dansantee/OctoPrint,bicephale/OctoPrint,CapnBry/OctoPrint,Jaesin/OctoPrint,nicanor-romero/OctoPrint,eliasbakken/OctoPrint,SeveQ/OctoPrint,MoonshineSG/OctoPrint,shohei/Octoprint,JackGavin13/octoprint-test-not-finished,spapadim/OctoPrint,eliasbakken/OctoPrint,Mikk36/OctoPrint,Skeen/OctoPrint,Skeen/OctoPrint,bicephale/OctoPrint,leductan-nguyen/RaionPi,dragondgold/OctoPrint,senttech/OctoPrint,MoonshineSG/OctoPrint,CapnBry/OctoPrint,MoonshineSG/OctoPrint,punkkeks/OctoPrint,eddieparker/OctoPrint,chriskoz/OctoPrint,foosel/OctoPrint,javivi001/OctoPrint,nicanor-romero/OctoPrint,beeverycreative/BEEweb,jneves/OctoPrint,Salandora/OctoPrint,Javierma/OctoPrint-TFG,eliasbakken/OctoPrint,masterhou/OctoPrint,ryanneufeld/OctoPrint,shaggythesheep/OctoPrint,senttech/OctoPrint,alex1818/OctoPrint,shohei/Octoprint,ErikDeBruijn/OctoPrint,Salandora/OctoPrint,ryanneufeld/OctoPrint,jneves/OctoPrint,ErikDeBruijn/OctoPrint,foosel/OctoPrint,punkkeks/OctoPrint,ErikDeBruijn/OctoPrint,senttech/OctoPrint,foosel/OctoPrint,shohei/Octoprint,Jaesin/OctoPrint,nickverschoor/OctoPrint,senttech/OctoPrint,spapadim/OctoPrint,chriskoz/OctoPrint,dragondgold/OctoPrint,bicephale/OctoPrint,uuv/OctoPrint,beeverycreative/BEEweb,CapnBry/OctoPrint,Skeen/OctoPrint,javivi001/OctoPrint,bicephale/OctoPrint,jneves/OctoPrint,spapadim/OctoPrint,dragondgold/OctoPrint,shohei/Octoprint,nickverschoor/OctoPrint,EZ3-India/EZ-Remote,nicanor-romero/OctoPrint,mcanes/OctoPrint,Jaesin/OctoPrint,Jaesin/OctoPrint,Mikk36/OctoPrint,MaxOLydian/OctoPrint,MaxOLydian/OctoPrint,nickverschoor/OctoPrint,Mikk36/OctoPrint,leductan-nguyen/RaionPi,mcanes/OctoPrint,CapnBry/OctoPrint,shaggythesheep/OctoPrint,dansantee/OctoPrint,EZ3-India/EZ-Remote,dansantee/OctoPrint,EZ3-India/EZ-Remote,Javierma/OctoPrint-TFG,javivi001/OctoPrint,masterhou/OctoPrint,ryanneufeld/OctoPrint