diff --git a/.gitignore b/.gitignore
index 485dee6..8e24b65 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .idea
+cmake-build-debug
diff --git a/basin/src/anticheat.c b/basin/src/anticheat.c
index 8dd168d..fe9f175 100644
--- a/basin/src/anticheat.c
+++ b/basin/src/anticheat.c
@@ -3,21 +3,36 @@
 #include "profile.h"
 #include "anticheat.h"
 
-int ac_lock = 0;
-#define AC_BEGIN
-#define AC_END(ret) return ret;
+#define AC_BEGIN beginProfilerSection("player_anticheat");
+#define AC_END(ret) { endProfilerSection("player_anticheat"); return ret; }
+
+int ac_chat(struct player* player, char* msg) {
+	AC_BEGIN
+	for (char* p = msg; *p; p++) {
+		if (*p < 32 || *p == 127 || *p == '\u00A7') {
+			kickPlayer(player, "Invalid chat message");
+			AC_END(1);
+		}
+	}
+	AC_END(0)
+}
 
 int ac_tick(struct player* player, int onground) {
 	AC_BEGIN
+
 	AC_END(0)
 }
 
 int ac_ticklook(struct player* player, float yaw, float pitch) {
 	AC_BEGIN
+	if (!isfinite(yaw) || !isfinite(pitch))
+		AC_END(1)
 	AC_END(0)
 }
 
 int ac_tickpos(struct player* player, double x, double y, double z) {
 	AC_BEGIN
+	if (!isfinite(x) || !isfinite(y) || !isfinite(z))
+		AC_END(1)
 	AC_END(0);
 }
\ No newline at end of file
diff --git a/basin/src/anticheat.h b/basin/src/anticheat.h
index 6a3f210..3180417 100644
--- a/basin/src/anticheat.h
+++ b/basin/src/anticheat.h
@@ -1,6 +1,7 @@
 #ifndef BASIN_ANTICHEAT_H_
 #define BASIN_ANTICHEAT_H_
 
+int ac_chat(struct player* player, char* msg);
 int ac_tick(struct player* player, int onground);
 int ac_ticklook(struct player* player, float yaw, float pitch);
 int ac_tickpos(struct player* player, double x, double y, double z);
diff --git a/basin/src/player.c b/basin/src/player.c
index be9d91d..31f0f0d 100644
--- a/basin/src/player.c
+++ b/basin/src/player.c
@@ -71,11 +71,6 @@ struct player* newPlayer(struct entity* entity, char* name, struct uuid uuid, st
 	struct timespec ts;
 	clock_gettime(CLOCK_MONOTONIC, &ts);
 	player->reachDistance = 6.f;
-	player->acstate.real_onGround = 1;
-	player->acstate.flightInfraction = 0;
-	player->acstate.ldy = 0.;
-	player->acstate.lastJump = 0;
-	player->acstate.offGroundTime = 0;
 	player->spawnedIn = 0;
 	player->llTick = 0;
 	player->triggerRechunk = 0;
@@ -157,6 +152,8 @@ void player_receive_packet(struct player* player, struct packet* inp) {
 		}
 	} else if (inp->id == PKT_PLAY_SERVER_CHATMESSAGE) {
 		char* msg = inp->data.play_server.chatmessage.message;
+		if (ac_chat(player, msg))
+			goto cont;
 		if (startsWith(msg, "/")) {
 			callCommand(player, msg + 1);
 		} else {
diff --git a/basin/src/player.h b/basin/src/player.h
index 0c46e25..0d74906 100644
--- a/basin/src/player.h
+++ b/basin/src/player.h
@@ -11,11 +11,6 @@
 #include "network.h"
 
 typedef struct _acstate {
-	uint8_t real_onGround;
-	uint8_t flightInfraction;
-	double ldy;
-	size_t lastJump;
-	uint32_t offGroundTime;
 } acstate_t;
 
 struct player {