From 39316ea3c6f1f856ab2afbee8862a64836504feb Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Wed, 26 Oct 2022 16:23:00 +0200
Subject: [PATCH] Function ngSpice_Circ() may send empty lines to shared
 ngspice. Skip these lines while processing the netlist array.

---
 src/frontend/inp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/frontend/inp.c b/src/frontend/inp.c
index ad7099ccd..e1735ac12 100644
--- a/src/frontend/inp.c
+++ b/src/frontend/inp.c
@@ -1878,8 +1878,12 @@ void create_circbyline(char *line, bool reset, bool lastline)
         circarray = TREALLOC(char *, circarray, n_elem_alloc);
     }
 
-    /* Remove any leading whitespace by shifting */
     char *p_src = skip_ws(line);
+    /* return if line is empty */
+    if (*p_src == '\0')
+        return;
+
+    /* Remove any leading whitespace by shifting */
     if (p_src != line) {
         char *p_dst = line;
         char ch_cur;