From 9a77d224448b68f28e250cda2c047340851bcb53 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Wed, 27 Nov 2019 23:31:22 +0100
Subject: [PATCH] prevent crash if 0 length vector is assessed

---
 src/spicelib/devices/vsrc/vsrcask.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/spicelib/devices/vsrc/vsrcask.c b/src/spicelib/devices/vsrc/vsrcask.c
index bdf922c46..752fdc688 100644
--- a/src/spicelib/devices/vsrc/vsrcask.c
+++ b/src/spicelib/devices/vsrc/vsrcask.c
@@ -92,7 +92,10 @@ VSRCask(CKTcircuit *ckt, GENinstance *inst, int which, IFvalue *value, IFvalue *
                 strcpy(errMsg,msg);
                 return(E_ASKCURRENT);
             } else {
-                value->rValue = *(ckt->CKTrhsOld+here->VSRCbranch);
+                if (ckt->CKTrhsOld)
+                    value->rValue = *(ckt->CKTrhsOld + here->VSRCbranch);
+                else
+                    value->rValue = 0.;
             }
             return(OK);
         case VSRC_POWER: