diff --git a/parts/language/lang_en.lua b/parts/language/lang_en.lua
index af588351..61372a7b 100644
--- a/parts/language/lang_en.lua
+++ b/parts/language/lang_en.lua
@@ -73,6 +73,9 @@ return {
     cc_fixed="CC is incompatible with fixed sequences.",
     cc_swap="CC is incompatible when the hold mode is set to Swap.",
     cc_solid="CC is incompatible with filled line in the field.",
+    cc_field_too_high="CC is incompatible with fields higher than 40.",
+    ai_prebag="AI is incompatible with custom sequences that contain non-tetrominoes.",
+    ai_mission="AI is incompatible with custom missions.",
     switchSpawnSFX="Please turn on the block spawn SFX!",
     needRestart="Restart to apply all changes.",
 
diff --git a/parts/language/lang_es.lua b/parts/language/lang_es.lua
index 1ce41da1..345fcd65 100644
--- a/parts/language/lang_es.lua
+++ b/parts/language/lang_es.lua
@@ -72,6 +72,7 @@ return {
     cc_fixed="CC no es compatible con piezas prefijadas",
     cc_swap="CC no es compatible con Swap Hold",
     -- cc_solid="CC is incompatible with filled line in the field.",
+    -- cc_field_too_high="CC is incompatible with fields higher than 40.",
     switchSpawnSFX="Habilita los sonidos de aparición de las piezas ;)",
     needRestart="Reinicia para aplicar los cambios.",
 
diff --git a/parts/language/lang_fr.lua b/parts/language/lang_fr.lua
index ff7c8112..eff6c62b 100644
--- a/parts/language/lang_fr.lua
+++ b/parts/language/lang_fr.lua
@@ -73,6 +73,7 @@ return {
     cc_fixed="CC est incompatible avec les séquences fixes",
     cc_swap="CC est incompatible avec le mode de maintien du swap",
     -- cc_solid="CC is incompatible with filled line in the field.",
+    -- cc_field_too_high="CC is incompatible with fields higher than 40.",
     switchSpawnSFX="Activez les effets sonores d'apparition des pièces pour jouer.",
     needRestart="Redémarrez pour appliquer toutes les modifications.",
 
diff --git a/parts/language/lang_id.lua b/parts/language/lang_id.lua
index 8526b149..67556668 100644
--- a/parts/language/lang_id.lua
+++ b/parts/language/lang_id.lua
@@ -74,6 +74,7 @@ return {
     cc_fixed="CC tidak cocok dengan urutan tetap.",
     cc_swap="CC tidak cocok dengan mode simpan tukar.",
     -- cc_solid="CC is incompatible with filled line in the field.",
+    -- cc_field_too_high="CC is incompatible with fields higher than 40.",
     switchSpawnSFX="Nyalakan efek suara munculan blok!",
     needRestart="Ulangi untuk menerapkan perubahan.",
 
diff --git a/parts/language/lang_ja.lua b/parts/language/lang_ja.lua
index 21a7d958..ec73b2a6 100644
--- a/parts/language/lang_ja.lua
+++ b/parts/language/lang_ja.lua
@@ -74,6 +74,7 @@ return {
     cc_fixed="CCはミノ順の指定に非対応です!",
     cc_swap="CCはホールドモード、Swapに非対応です!",
     -- cc_solid="CC is incompatible with filled line in the field.",
+    -- cc_field_too_high="CC is incompatible with fields higher than 40.",
     switchSpawnSFX="ブロック出現時の効果音をONにしてください!",
     needRestart="すべての変更を適用する為にリスタートしてください!",
 
diff --git a/parts/language/lang_pt.lua b/parts/language/lang_pt.lua
index f3505b04..02176d87 100644
--- a/parts/language/lang_pt.lua
+++ b/parts/language/lang_pt.lua
@@ -63,6 +63,7 @@ return {
     -- cc_fixed="CC is incompatible with fixed sequences",
     -- cc_swap="CC is incompatible with swap holdmode",
     -- cc_solid="CC is incompatible with filled line in the field.",
+    -- cc_field_too_high="CC is incompatible with fields higher than 40.",
     switchSpawnSFX="Switch on spawn SFX to play",
     needRestart="Funciona após reiniciar",
 
diff --git a/parts/language/lang_symbol.lua b/parts/language/lang_symbol.lua
index 496430c4..350bb6e2 100644
--- a/parts/language/lang_symbol.lua
+++ b/parts/language/lang_symbol.lua
@@ -63,6 +63,7 @@ return {
     cc_fixed="CC X!!!",
     cc_swap="CC X!!!",
     cc_solid="CC X!!!",
+    cc_field_too_high="CC X!!!",
     needRestart="!!*#R#*!!",
 
     loadError_errorMode="'$1' ↑x!: no load mode '$2'",
diff --git a/parts/language/lang_vi.lua b/parts/language/lang_vi.lua
index b90d988d..b978e38d 100644
--- a/parts/language/lang_vi.lua
+++ b/parts/language/lang_vi.lua
@@ -78,6 +78,8 @@ return {
     cc_fixed="CC không tương thích với trình xáo gạch cố định",
     cc_swap="CC không tương thích với chế độ Hold là Chuyển",
     cc_solid="CC không tương thích với bảng có hàng đã lấp đầy.",
+    -- cc_solid="CC is incompatible with filled line in the field.",
+    -- cc_field_too_high="CC is incompatible with fields higher than 40.",
     switchSpawnSFX="Vui lòng bật Spawn SFX để chơi!",
     needRestart="Khởi động lại để áp dụng mọi thay đổi.",
 
diff --git a/parts/language/lang_zh.lua b/parts/language/lang_zh.lua
index 352bcb24..ad486db8 100644
--- a/parts/language/lang_zh.lua
+++ b/parts/language/lang_zh.lua
@@ -73,6 +73,7 @@ return {
     cc_fixed="不能同时开启CC和固定序列",
     cc_swap="不能同时开启CC和swap的暂存模式",
     cc_solid="开启CC时不能存在预先填满的行",
+    cc_field_too_high="开启CC时最高出块高度不能超过40",
     switchSpawnSFX="请开启方块生成音效",
     needRestart="重新开始以生效",
 
diff --git a/parts/language/lang_zh_code.lua b/parts/language/lang_zh_code.lua
index 1dbab0be..b4e30f24 100644
--- a/parts/language/lang_zh_code.lua
+++ b/parts/language/lang_zh_code.lua
@@ -72,6 +72,7 @@ return {
     cc_fixed="assert(AI==CC and Sequence==Fixed)",
     cc_swap="assert(AI==CC and Hold.Mode==Swap)",
     cc_solid="assert(AI==CC and filledLine in Field)",
+    cc_field_too_high="assert(AI==CC and Field.Height>=40)",
     switchSpawnSFX="SpawnSFX=false",
     needRestart="NeedRestart=true",
 
diff --git a/parts/language/lang_zh_trad.lua b/parts/language/lang_zh_trad.lua
index 070da6b4..a59caa09 100644
--- a/parts/language/lang_zh_trad.lua
+++ b/parts/language/lang_zh_trad.lua
@@ -73,6 +73,7 @@ return {
     cc_fixed="不能同時開啟CC和固定序列",
     cc_swap="不能同時開啟CC和swap的暫存模式",
     cc_solid="開啟CC時不能存在預先填滿的行",
+    cc_field_too_high="開啓CC時最高出塊高度不能超過40",
     switchSpawnSFX="請開啟方塊生成音效",
     needRestart="重新啟動以應用所有更改",
 
diff --git a/parts/scenes/customGame.lua b/parts/scenes/customGame.lua
index 5ad69f0c..e9fc1139 100644
--- a/parts/scenes/customGame.lua
+++ b/parts/scenes/customGame.lua
@@ -118,6 +118,13 @@ local function _play(mode)
                 MES.new('error',text.cc_swap)
                 return
             end
+            if CUSTOMGAME_LOCAL.customenv.fieldH>=35 then
+                -- the error message says 40, but we detect 35
+                -- because with a few garbage lines, the field height can be pushed to 40
+                MES.new('warn',text.cc_field_too_high)
+                -- warning instead of error because we think it's not a big deal
+                -- the bot just dies very quickly
+            end
             for _,F in next,CUSTOMGAME_LOCAL.field do
                 for y=1,#F do
                     if not TABLE.find(F[y],0) then