diff -r 9136db051f28 -r eda1ff20cb27 ui/server/button.c
--- a/ui/server/button.c	Sun Dec 28 19:01:05 2025 +0100
+++ b/ui/server/button.c	Mon Dec 29 17:46:10 2025 +0100
@@ -37,7 +37,7 @@
 
 cxmutstr ui_button_args_to_string(UiContext *ctx, UiButtonArgs *args) {
     CxBuffer buf;
-    cxBufferInit(&buf, NULL, 256, ctx->allocator, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_FREE_CONTENTS);
+    cxBufferInit(&buf, ctx->allocator, NULL, 256, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_FREE_CONTENTS);
     
     cxBufferPutString(&buf, "{");
     
@@ -54,7 +54,7 @@
 
 cxmutstr ui_toggle_args_to_string(UiContext *ctx, UiToggleArgs *args, cxmutstr value) {
     CxBuffer buf;
-    cxBufferInit(&buf, NULL, 256, ctx->allocator, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_FREE_CONTENTS);
+    cxBufferInit(&buf, ctx->allocator, NULL, 256, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_FREE_CONTENTS);
     
     cxBufferPutString(&buf, "{");
     
@@ -89,7 +89,7 @@
 
 cxmutstr ui_button_serialize(UiCallbackWidget *w) {
     CxBuffer buf;
-    cxBufferInit(&buf, NULL, 1024, NULL, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_FREE_CONTENTS);
+    cxBufferInit(&buf, cxDefaultAllocator, NULL, 1024, CX_BUFFER_AUTO_EXTEND | CX_BUFFER_FREE_CONTENTS);
     
     cxBufferPutString(&buf, "{");
     ui_serialize_type_obj_id(&w->widget, &buf);