diff -N -u -r -X exclude_files squid-1.0.beta15/src/store.c squid-1.0.beta15.henrik/src/store.c
--- squid-1.0.beta15/src/store.c	Sun Jun  9 17:52:26 1996
+++ squid-1.0.beta15.henrik/src/store.c	Mon Jun 10 16:01:27 1996
@@ -2384,6 +2384,15 @@
 int storeEntryValidToSend(e)
      StoreEntry *e;
 {
+    if ((e->mem_status == NOT_IN_MEMORY) &&	/* Not in memory */
+	(e->swap_status != SWAP_OK) &&	/* Not on disk */
+	(e->store_status != STORE_PENDING)	/* Not being fetched */
+	) {
+	debug(20,0,"storeEntryValidToSend: A non existent object detected. This can't be right\n");
+	debug(20,0,"storeEntryValidToSend: Entry Dump:\n%s\n", storeToString(e));
+	return 0;
+    }
+
     if (squid_curtime < e->expires)
 	return 1;
     if (e->expires == 0 && e->store_status == STORE_PENDING && e->mem_status != NOT_IN_MEMORY)