diff -r b174e721663e -r 6d0da97105d8 ui/motif/pathbar.c
--- a/ui/motif/pathbar.c	Sat Dec 27 22:47:56 2025 +0100
+++ b/ui/motif/pathbar.c	Thu Jan 08 18:06:04 2026 +0100
@@ -186,9 +186,9 @@
     
     cxmutstr url;
     if(add_separator) {
-        url = cx_strcat(3, base, cx_str("/"), path);
+        url = cx_strcat(CX_NULLSTR, 3, base, cx_str("/"), path);
     } else {
-        url = cx_strcat(2, base, path);
+        url = cx_strcat(CX_NULLSTR, 2, base, path);
     }
     
     return url;