Wow client crashes when approaching Lord Rhyolith in Firelands raid

[pkman]

[Location, Faction, Race] Firelands raid, Horde, Bloodelf paladin
[Problem description] When crossing the lava mote to get to Lord Rhyolith's platform the wow client crashes.
[How it should work] Crossing the lava to reach Lord Rhyolith should not crash the wow client.