It seems like any successful attempts to change your name with impersonation crashes the game. I've tested this three times for three crashes with different names. Upon logging back in the character will have their impersonated name as normal.
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ERROR in
action number 1
of Async Event: Networking
for object NetworkHandler:
Push :: Execution Error - Variable Index [-1] out of range [10] - -7.descriptors(100368,-1)
at gml_Script_PacketSwitcher
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gml_Script_PacketSwitcher (line -1)
gml_Script_ReceiveNetworkMessage
gml_Object_NetworkHandler_Other_68