diff --git a/PHI-CL/control/chest.lua b/PHI-CL/control/chest.lua
index 34eb2d4..7ccee57 100644
--- a/PHI-CL/control/chest.lua
+++ b/PHI-CL/control/chest.lua
@@ -1,7 +1,7 @@
 local main = {}
 
 function main.build(event)
-    if event.entity.type ~= 'logistic-container' or event.entity.prototype.logistic_mode ~= 'storage' then
+    if event.entity.type ~= 'logistic-container' or not event.entity.prototype or not event.entity.prototype.logistic_mode or event.entity.prototype.logistic_mode ~= 'storage' then
         return
     end