diff --git a/gamemode/sh_compatibility.lua b/gamemode/sh_compatibility.lua
new file mode 100644
index 00000000..04555eea
--- /dev/null
+++ b/gamemode/sh_compatibility.lua
@@ -0,0 +1,38 @@
+AddCSLuaFile()
+
+local badAddonIds = {
+    -- "Episode animation fixes"
+    ["3022183926"] = true,
+    ["1879556056"] = true,
+    ["2576796480"] = true,
+    ["3263204957"] = true,
+    ["1881393042"] = true,
+    ["1095903501"] = true,
+    ["1890049841"] = true,
+    -- Reserved.
+}
+
+local function IsBadAddon(id)
+    return badAddonIds[id] ~= nil
+end
+
+local function CheckAddonCompatibility()
+    local addons = engine.GetAddons()
+    local badAddons = {}
+    for _, addon in pairs(addons) do
+        if addon.mounted and IsBadAddon(addon.wsid) then
+            table.insert(badAddons, addon)
+        end
+    end
+    if #badAddons == 0 then
+        return
+    end
+    local errorInfo = "WARNING: Following addons are obsolete or cause issues:\n"
+    for _, addon in pairs(badAddons) do
+        errorInfo = errorInfo .. " - " .. addon.title .. " (" .. addon.wsid .. ")\n"
+    end
+    errorInfo = errorInfo .. "Disable them and restart the game for the best experience.\n"
+    ErrorNoHalt(errorInfo)
+end
+
+CheckAddonCompatibility()
diff --git a/gamemode/shared.lua b/gamemode/shared.lua
index 35248788..95890649 100644
--- a/gamemode/shared.lua
+++ b/gamemode/shared.lua
@@ -3,6 +3,7 @@ if SERVER then
 end
 
 DEFINE_BASECLASS("gamemode_base")
+include("sh_compatibility.lua")
 include("sh_lambda_build.lua")
 include("sh_debug.lua")
 include("sh_convars.lua")