From 3def275be4828b59b1b5a9ab5bb4b88a5fd49eb9 Mon Sep 17 00:00:00 2001
From: Jim Monte <jimmonte@users.sourceforge.net>
Date: Sat, 15 Jun 2019 00:39:56 +0200
Subject: [PATCH] [PATCH #76] Fixed access violation when iplot called without
 a circuit  loaded.

---
 src/frontend/breakp.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/frontend/breakp.c b/src/frontend/breakp.c
index 9256a5368..ae5c5d97c 100644
--- a/src/frontend/breakp.c
+++ b/src/frontend/breakp.c
@@ -176,6 +176,13 @@ com_trce(wordlist *wl)
 void
 com_iplot(wordlist *wl)
 {
+    /* Check for an active circuit */
+    if (ft_curckt == (struct circ *) NULL) {
+        fprintf(cp_err, "No circuit loaded. "
+                "Incremental plotting is not possible.\n");
+        return;
+    }
+
     /* settrace(wl, VF_PLOT); */
 
     struct dbcomm *d, *td, *currentdb = NULL;