Hi all!
How to deal with such type of error? No my code in trace, no clue what happened and where to see.

Task terminated with unhandled exception: Acquiring reader of already owned connection.
core.exception.AssertError@../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/drivers/libevent2_tcp.d(419): Acquiring reader of already owned connection.
----------------
??:? _d_assert_msg [0x914651]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/drivers/libevent2_tcp.d:419 void vibe.core.drivers.libevent2_tcp.Libevent2TCPConnection.checkReader() [0x875c5f]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/drivers/libevent2_tcp.d:227 @property bool vibe.core.drivers.libevent2_tcp.Libevent2TCPConnection.dataAvailableForRead() [0x874e5e]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/drivers/libevent2_tcp.d:306 bool vibe.core.drivers.libevent2_tcp.Libevent2TCPConnection.waitForData(core.time.Duration) [0x8753c0]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/http/server.d:1557 void vibe.http.server.handleHTTPConnection(vibe.core.net.TCPConnection, vibe.http.server.HTTPListenInfo) [0x823e8a]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/http/server.d:1433 void vibe.http.server.listenHTTPPlain(vibe.http.server.HTTPServerSettings).doListen(vibe.http.server.HTTPListenInfo, bool, bool).__lambda4(vibe.core.net.TCPConnection) [0x823810]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/drivers/libevent2_tcp.d:610 void vibe.core.drivers.libevent2_tcp.ClientTask.execute() [0x8da8b1]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/core.d:488 void vibe.core.core.makeTaskFuncInfo!(void delegate()).makeTaskFuncInfo(ref void delegate()).callDelegate(vibe.core.core.TaskFuncInfo*) [0x75ed21]
../../.dub/packages/vibe-d-0.7.29/vibe-d/source/vibe/core/core.d:1119 void vibe.core.core.CoreTask.run() [0x868715]
??:? void core.thread.Fiber.run() [0x96af65]
??:? fiber_entryPoint [0x96ace7]
??:? [0xffffffff]