Exception when chat message too long

When receiving a chat message that is too long (for example from 'say @e'), the connection closes with the following exception:
Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: readerIndex(1) + length(1) exceeds writerIndex(1): UnpooledHeapByteBuf(ridx: 1, widx: 1, cap: 1)
The server-log contains the following exception:
io.netty.handler.codec.EncoderException: String too big (was 53129 bytes encoded, max 32767)