Flat/texture change crash

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SRB2 v2.1.16 -ERROR LOG-


srb2win caused an Access Violation in module srb2win.exe at 0023:004d9c61.
Exception handler called in main thread.
Error occurred at 12/7/2016 20:32:22.
C:\Users\Despair\Desktop\SRB2\srb2win.exe, run by quark.
4 processor(s), type 586 6.9474.
Program Memory from 0x00010000 to 0x7FFEFFFF
3895 MBytes physical memory.
Read from location 00000064 caused an access violation.

Registers:
EAX=00000000 CS=0023 EIP=004d9c61 EFLGS=00010246
EBX=0000a70b SS=002b ESP=0028fd30 EBP=00196e24
ECX=00000000 DS=002b ESI=00000000 FS=0053
EDX=00000000 ES=002b EDI=0000a70a GS=002b
Command Line parameters: Bytes at CS : EIP:
f7 ?? 40 ?? 64 ?? 00 ?? 10 ?? 20 ?? 00 ?? 0f ?? 95 ?? c0 ?? 25 ?? ff ?? 00 ?? 00 ?? 00 ?? 89 ??
Stack dump: