Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/5013
Fixed on master in
0e5fb0b78cd0a3ccb144071a47579eb6c3d0570a
e9e7c3372189db7e933ff59114b9ec6245838eda
Fixed on release-1.4 in
25a28ab32609c45fb8c40f717148e32fb453d2fc
9f68212603e3601e2f7a67ff93be9b15844c14da---
