I'm having the same error reported by HarryPotter.
Reporting this one:
[SM] Blaming: Survivor Respawn.smx
[SM] Call stack trace:
[SM]  GetEntProp
[SM]  Line 928, /home/forums/content/files/2/9/0/3/2/7/185091.attach::IsClientIdle
[SM]  Line 646, /home/forums/content/files/2/9/0/3/2/7/185091.attach::TimerCount
I added a HasEntProp(i, Prop_Send, "m_humanSpectatorUserID")
check to prevent this.
Also the plugin needs do hook convar changes, if I change a convar in midgame it doesn't apply cause the plugin reads the cvar only once (3 seconds after PluginStart).
I changed it to always read from ConVar as a quick fix.
Added pt-br and pt-pt translations.