diff --git a/manifest.json b/manifest.json
index dcbf3b2..f54bf7c 100644
--- a/manifest.json
+++ b/manifest.json
@@ -17,5 +17,5 @@
     "conflicts": [
         "Jen"
     ],
-    "version": "1.5.29"
+    "version": "1.5.30"
 }
\ No newline at end of file
diff --git a/src/back.lua b/src/back.lua
index 9db444f..b3f1f10 100644
--- a/src/back.lua
+++ b/src/back.lua
@@ -654,7 +654,11 @@ back {
 
         for _, v in pairs(G.P_CENTERS) do
             if v.apply and not banned_keys[v.key] and (v.set == "Back" or v.set == "Sleeve") then
-                v:apply(...)
+                local status, err = pcall(v.apply, v, ...)
+
+                if not status then
+                    sendWarnMessage(v.key .. "'s apply cannot run: " .. err)
+                end
             end
         end
     end,
@@ -676,7 +680,11 @@ back {
     alt_calculate = function(_, ...)
         for _, v in pairs(G.P_CENTERS) do
             if v.calculate and not banned_keys[v.key] and (v.set == "Back" or v.set == "Sleeve") then
-                v:calculate(...)
+                local status, err = pcall(v.calculate, v, ...)
+
+                if not status then
+                    sendWarnMessage(v.key .. "'s calculate cannot run: " .. err)
+                end
             end
         end
     end,