i think i cant help you if this is a problem related to sinusbot, but just for be sure, did you recopy the plugin after upgrade?
"To upgrade, just extract the archive and overwrite the old files with the new ones. Please also update the plugin by copying it from plugin/libsoundbot_plugin.so to TeamSpeakClient/plugins/libsoundbot_plugin.so"
Commands:
cd /opt/ts3soundboard
cp plugin/libsoundbot_plugin.so /opt/ts3soundboard/TeamSpeak3-Client-linux_amd64/plugins
IF that dont resolve you have to wait for a staffer sorry