bug: crash in StartLagCompensation

[maxime1907]

• https://crash.limetech.org/cbmyt5ehzn4j
• https://crash.limetech.org/z45wwhxaw4ei
• https://crash.limetech.org/v53m7w25xco3

Not sure if its due to cssfixes, physhooks or just a bug in valve codebase:

• https://github.com/srcdslab/source-engine-2018-hl2_src/blob/0301dccccd5553587cba988daa0763081a1f409e/game/shared/cstrike/fx_cs_shared.cpp#L263
• https://github.com/srcdslab/source-engine-2018-hl2_src/blob/0301dccccd5553587cba988daa0763081a1f409e/game/server/player_lagcompensation.cpp#L328