diff --git a/addons/sourcemod/scripting/autopause.sp b/addons/sourcemod/scripting/autopause.sp
index fbd289908..55a31ac9d 100644
--- a/addons/sourcemod/scripting/autopause.sp
+++ b/addons/sourcemod/scripting/autopause.sp
@@ -242,7 +242,7 @@ void Event_PlayerDisconnect(Event hEvent, char[] sEventName, bool dontBroadcast)
     if (!teamPlayers.ContainsKey(sAuthId)) 
         return;
 
-    if (GetClientTeam(client) == L4D_TEAM_SURVIVOR && !IsPlayerAlive(client))
+    if (IsClientInGame(client) && GetClientTeam(client) == L4D_TEAM_SURVIVOR && !IsPlayerAlive(client))
     {
         if (convarDebug.BoolValue)
         {
diff --git a/addons/sourcemod/scripting/bequiet.sp b/addons/sourcemod/scripting/bequiet.sp
index befeb6dc5..f48840287 100644
--- a/addons/sourcemod/scripting/bequiet.sp
+++ b/addons/sourcemod/scripting/bequiet.sp
@@ -68,7 +68,7 @@ Action TeamSay_Callback(int client, char[] command, int args)
         return Plugin_Handled;
     }
     
-    if (bSpecSeeChat && GetClientTeam(client) != 1)
+    if (bSpecSeeChat && IsValidClient(client) && GetClientTeam(client) != 1)
     {
         char sChat[256];
         GetCmdArgString(sChat, 256);
diff --git a/addons/sourcemod/scripting/l4d2_ghost_warp.sp b/addons/sourcemod/scripting/l4d2_ghost_warp.sp
index b300f9eed..00d6070dc 100644
--- a/addons/sourcemod/scripting/l4d2_ghost_warp.sp
+++ b/addons/sourcemod/scripting/l4d2_ghost_warp.sp
@@ -112,7 +112,8 @@ Action Cmd_WarpToSurvivor(int iClient, int iArgs)
 		return Plugin_Handled;
 	}
 
-	if (GetClientTeam(iClient) != L4D2Team_Infected
+	if (!IsClientInGame(iClient)
+		|| GetClientTeam(iClient) != L4D2Team_Infected
 		|| GetEntProp(iClient, Prop_Send, "m_isGhost", 1) < 1
 		|| !IsPlayerAlive(iClient)
 	) {
@@ -225,7 +226,8 @@ void Hook_OnPostThinkPost(int iClient)
 		return;
 	}
 
-	if (GetClientTeam(iClient) != L4D2Team_Infected
+	if (!IsClientInGame(iClient)
+		|| GetClientTeam(iClient) != L4D2Team_Infected
 		|| GetEntProp(iClient, Prop_Send, "m_isGhost", 1) < 1
 		|| !IsPlayerAlive(iClient)
 	) {
diff --git a/addons/sourcemod/scripting/playermanagement.sp b/addons/sourcemod/scripting/playermanagement.sp
index c2b147996..2ac428bb7 100644
--- a/addons/sourcemod/scripting/playermanagement.sp
+++ b/addons/sourcemod/scripting/playermanagement.sp
@@ -560,6 +560,10 @@ stock int GetPummelQueueAttacker(int client)
 
 stock L4D2Team GetClientTeamEx(int client)
 {
+	if (!IsClientInGame(client))
+	{
+		return L4D2Team_None;
+	}
 	return view_as<L4D2Team>(GetClientTeam(client));
 }
 
diff --git a/addons/sourcemod/scripting/readyup/player.inc b/addons/sourcemod/scripting/readyup/player.inc
index 1af0de784..a21fc661f 100644
--- a/addons/sourcemod/scripting/readyup/player.inc
+++ b/addons/sourcemod/scripting/readyup/player.inc
@@ -98,8 +98,8 @@ void SetClientFrozen(int client, bool freeze)
 
 bool IsPlayer(int client)
 {
-	int team = GetClientTeam(client);
-	return (team == L4D2Team_Survivor || team == L4D2Team_Infected);
+	return IsClientInGame(client) && IsClientConnected(client)
+		&& (GetClientTeam(client) == L4D2Team_Survivor || GetClientTeam(client) == L4D2Team_Infected);
 }
 
 void ReturnPlayerToSaferoom(int client, bool flagsSet = true)