diff -r c949c6ab5346 -r bbe2925eb590 libidav/methods.c
--- a/libidav/methods.c	Thu Nov 28 17:20:19 2024 +0100
+++ b/libidav/methods.c	Thu Nov 28 17:53:13 2024 +0100
@@ -836,7 +836,7 @@
     {
         char prefix[8];
         int pfxnum = 0;
-        if (cxListSize(data->set) > 0) {
+        if (data->set && cxListSize(data->set) > 0) {
             CxIterator i = cxListIterator(data->set);
             cx_foreach(DavProperty*, p, i) {
                 if (strcmp(p->ns->name, "DAV:")) {
@@ -845,7 +845,7 @@
                 }
             }
         }
-        if (cxListSize(data->remove) > 0) {
+        if (data->remove && cxListSize(data->remove) > 0) {
             CxIterator i = cxListIterator(data->remove);
             cx_foreach(DavProperty*, p, i) {
                 if (strcmp(p->ns->name, "DAV:")) {