Removing the last destination object from refined pipes with an active extractor causes an unrecoverable server crash due to an array out of bounds error. Required server rollback and complete removal of the mod to resolve.
crash-2020-04-26_01.28.44-server.txt

We're having this issue as well on our server with the pack All the Mods 5.

Forge: net.minecraftforge:31.1.63
refinedpipes-0.4.jar Refined Pipes {[email protected] DONE}

See attached crashlogs:

crash-2020-05-03_17.31.08-server.txt
crash-2020-05-03_17.43.35-server.txt
crash-2020-05-03_18.02.58-server.txt
crash-2020-05-03_18.22.25-server.txt