diff --git a/code/datums/components/material_container.dm b/code/datums/components/material_container.dm
index 5860bd029b..51dc4ee8f7 100644
--- a/code/datums/components/material_container.dm
+++ b/code/datums/components/material_container.dm
@@ -73,7 +73,7 @@
 	if(!material_amount)
 		to_chat(user, "<span class='warning'>[I] does not contain sufficient materials to be accepted by [parent].</span>")
 		return
-	if((!precise_insertion || !GLOB.typecache_stack[I]) && !has_space(material_amount))
+	if((!precise_insertion || !GLOB.typecache_stack[I.type]) && !has_space(material_amount))
 		to_chat(user, "<span class='warning'>[parent] has not enough space. Please remove materials from [parent] in order to insert more.</span>")
 		return
 	user_insert(I, user)