minetest segfault backtrace

#0  0x0000555557d8e2ac in irr::core::vector3d<float>::getLength (this=0xc) at /home/lars/irrlicht/include/vector3d.h:129
No locals.
#1  0x000055555814bfd1 in checkMeshNormals (mesh=0x55555bad55a0) at /home/lars/minetest/src/client/mesh.cpp:345
        buffer = 0x55556660e310
        length = 3.0611365e-41
        i = 0
        buffer_count = 2
#2  0x0000555557f6d626 in GenericCAO::addToScene (this=0x5555665d06f0, tsrc=0x55555bd4e7a0, smgr=0x55555b6982a0) at /home/lars/minetest/src/client/content_cao.cpp:765
        mesh = 0x55555bad55a0
        grabMatrixNode = {
          __this = 0x5555665d06f0
        }
        setMaterial = {
          __this = 0x5555665d06f0
        }
        setSceneNodeMaterials = {
          __setMaterial = {
            __this = 0x5555665d06f0
          }
        }
#3  0x0000555557e824a0 in ClientEnvironment::addActiveObject (this=0x55556280eb40, object=0x5555665d06f0) at /home/lars/minetest/src/client/clientenvironment.cpp:371
No locals.
#4  0x0000555557e829eb in ClientEnvironment::addActiveObject (this=0x55556280eb40, id=2, type=101 'e',
    init_data="\001\000\000\000\000\002C1=qC\230˅\302\360\250\366", '\000' <wiederholt 13 Mal>, "\n\005\000\000\000\375\000\004\000\n\000\000\000\000\000\277\000\000\000\277\000\000\000\277\000\000\000?\000\000\000?\000\000\000?\000\000\000\277\000\000\000\277\000\000\000\277\000\000\000?\000\000\000?\000\000\000?\000\000\000\000\000\004mesh?\200\000\000?\200\000\000?\200\000\000\000\002\000(blank.png^[noalpha^[colorize:#000000:255\000(blank.png^[noalpha^[colorize:#FFFFFF:255\000"...) at /home/lars/minetest/src/client/clientenvironment.cpp:407
        obj = 0x5555665d06f0
        new_id = 65535
#5  0x00005555587d4fc6 in Client::handleCommand_ActiveObjectRemoveAdd (this=0x55556280ead0, pkt=0x7fffffffcaa0) at /home/lars/minetest/src/network/clientpackethandler.cpp:480
        i = 0
        type = 101 'e'
        removed_count = 0
        added_count = 1
        id = 2
#6  0x0000555557e143d0 in Client::handleCommand (this=0x55556280ead0, pkt=0x7fffffffcaa0) at /home/lars/minetest/src/client/client.cpp:963
        opHandle = @0x5555597f0720: {
          name = 0x5555593ca9c8 "TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD",
          state = TOCLIENT_STATE_CONNECTED,
          handler = (void (Client::*)(Client * const, NetworkPacket *)) 0x5555587d4cfe <Client::handleCommand_ActiveObjectRemoveAdd(NetworkPacket*)>
        }
#7  0x0000555557dfc661 in Client::ProcessData (this=0x55556280ead0, pkt=0x7fffffffcaa0) at /home/lars/minetest/src/client/client.cpp:1017
        command = TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD
        sender_peer_id = 1
#8  0x0000555557dfbd48 in Client::ReceiveAll (this=0x55556280ead0) at /home/lars/minetest/src/client/client.cpp:951