FML appears to be missing any signature data. This is not a good thing (?)

FML appears to be missing any signature data. This is not a good thing (?) - Black Pen Placed on White Paper

I installed a fresh Forge (1.8.9-11.15.1.1722) server (with Sponge 1.8.9-1691-3.1.0-BETA-1046). The host (running Debian) is headless, Minecraft starts correctly, but one line in the startup log is worrisome:

[main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing

There are no more errors (only INFO messages). I believe that FML means Forge Mod Loader, which then appears with its own log messages (like [FML]: Forge Mod Loader has successfully loaded 4 mods) and otherwise the server works fine (at least seems to do so, I connected from a client and walked around without issues.

Is this something I should be worried about?






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FML appears to be missing any signature data. This is not a good thing (?) - Man filling in form on parer at table
FML appears to be missing any signature data. This is not a good thing (?) - Wooden house shaped public bookcase with opened door filled with books and located in lush green park





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