diff --git a/usr.bin/sockstat/sockstat.c b/usr.bin/sockstat/sockstat.c
--- a/usr.bin/sockstat/sockstat.c
+++ b/usr.bin/sockstat/sockstat.c
@@ -1164,8 +1164,11 @@
 					f = RB_FIND(files_t, &ftree,
 					    &(struct file){ .xf_data =
 					    p->socket });
-					pos += xprintf("[%lu %d]",
-					    (u_long)f->xf_pid, f->xf_fd);
+					if (f != NULL) {
+						pos += xprintf("[%lu %d]",
+						    (u_long)f->xf_pid,
+						    f->xf_fd);
+					}
 				} else
 					pos += printaddr(&p->laddr->address);
 			}
@@ -1183,9 +1186,12 @@
 					f = RB_FIND(files_t, &ftree,
 					    &(struct file){ .xf_data =
 					    p->socket });
-					pos += xprintf("%s[%lu %d]",
-					    fref ? "" : ",",
-					    (u_long)f->xf_pid, f->xf_fd);
+					if (f != NULL) {
+						pos += xprintf("%s[%lu %d]",
+						    fref ? "" : ",",
+						    (u_long)f->xf_pid,
+						    f->xf_fd);
+					}
 					ref = p->faddr->nextref;
 					fref = false;
 				}