diff -r 07b815faa6ac -r f00d03835dd9 src/server/util/util.c
--- a/src/server/util/util.c	Tue Dec 30 21:44:49 2025 +0100
+++ b/src/server/util/util.c	Tue Jan 13 18:09:20 2026 +0100
@@ -592,9 +592,9 @@
     
     CxAllocator *a = pool_allocator(pool); 
     if(parent.ptr[parent.length-1] == '/') {
-        newstr = cx_strcat_a(a, 2, parent, child);
+        newstr = cx_strcat_a(a, CX_NULLSTR, 2, parent, child);
     } else {
-        newstr = cx_strcat_a(a, 3, parent, cx_str("/"), child);
+        newstr = cx_strcat_a(a, CX_NULLSTR, 3, parent, cx_str("/"), child);
     }
     
     return newstr;