Index: trunk/src/libcschem/abstract.c
===================================================================
--- trunk/src/libcschem/abstract.c	(revision 10304)
+++ trunk/src/libcschem/abstract.c	(revision 10305)
@@ -111,6 +111,7 @@
 void csch_abstract_uninit(csch_abstract_t *abs)
 {
 	htsp_entry_t *e;
+	long n;
 
 	csch_hlevel_free_tree(abs->hroot);
 
@@ -124,9 +125,15 @@
 		free(e->value); e->value = NULL;
 	}
 
+	for(n = 0; n < abs->orphaned_ports.used; n++) {
+		csch_aport_free_fields(abs->orphaned_ports.array[n]);
+		free(abs->orphaned_ports.array[n]);
+	}
+
 	htsp_uninit(&abs->nets);
 	htsp_uninit(&abs->comps);
 	htip_uninit(&abs->aid2obj);
+	vtp0_uninit(&abs->orphaned_ports);
 
 	memset(abs, 0, sizeof(csch_abstract_t));
 }
@@ -213,6 +220,8 @@
 
 	if (comp != NULL)
 		htsp_set(&comp->ports, port->name, port);
+	else
+		vtp0_append(&abs->orphaned_ports, port);
 	return port;
 }
 
Index: trunk/src/libcschem/abstract.h
===================================================================
--- trunk/src/libcschem/abstract.h	(revision 10304)
+++ trunk/src/libcschem/abstract.h	(revision 10305)
@@ -33,6 +33,7 @@
 #include <genht/htsp.h>
 #include <genht/htpp.h>
 #include <genlist/gendlist.h>
+#include <genvector/vtp0.h>
 
 #include "libcschem/common_types.h"
 #include "libcschem/attrib.h"
@@ -63,6 +64,7 @@
 	htul_t uid2id;     /* UID -> object id (cache) */
 	htsp_t nets;       /* global netname -> csch_anet_t */
 	htsp_t comps;      /* global name -> csch_acomp_t */
+	vtp0_t orphaned_ports; /* ports without a component parent; typical for sheet ports in a hierarchy */
 	long next_aid;
 
 	/* counters for unique names */