From 88e94b26c4d8d3ede31b47251f3a0369069f11fb Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Wed, 3 Jun 2026 16:40:45 +0200
Subject: [PATCH] Reset ckt->CKTag[0] and ckt->CKTag[1] upon successful return
 from transient simulation.

---
 src/spicelib/analysis/dcpss.c  | 1 +
 src/spicelib/analysis/dctran.c | 2 ++
 src/spicelib/analysis/optran.c | 1 +
 3 files changed, 4 insertions(+)

diff --git a/src/spicelib/analysis/dcpss.c b/src/spicelib/analysis/dcpss.c
index aa0cee3c8..6bd998f5a 100644
--- a/src/spicelib/analysis/dcpss.c
+++ b/src/spicelib/analysis/dcpss.c
@@ -1015,6 +1015,7 @@ shootingexit:
             FREE (err_conv) ;
             FREE (psstimes) ;
             FREE (pssvalues) ;
+            ckt->CKTag[0] = ckt->CKTag[1] = 0.;
             return (OK) ;
         }
     }
diff --git a/src/spicelib/analysis/dctran.c b/src/spicelib/analysis/dctran.c
index ff203a082..083986231 100644
--- a/src/spicelib/analysis/dctran.c
+++ b/src/spicelib/analysis/dctran.c
@@ -449,6 +449,7 @@ DCtran(CKTcircuit *ckt,
             fprintf(stdout, "\nNote: Autostop after %e s, all measurement conditions are fulfilled.\n", ckt->CKTtime);
 
         /* Final return from tran upon success */
+        ckt->CKTag[0] = ckt->CKTag[1] = 0.;
         return(OK);
     }
     if(SPfrontEnd->IFpauseTest()) {
@@ -907,6 +908,7 @@ resume:
                 SPfrontEnd->OUTendPlot(job->TRANplot);
                 job->TRANplot = NULL;
                 UPDATE_STATS(0);
+                ckt->CKTag[0] = ckt->CKTag[1] = 0.;
                 /* return upon convergence failure */
                 return(E_TIMESTEP);
             }
diff --git a/src/spicelib/analysis/optran.c b/src/spicelib/analysis/optran.c
index 86dceab55..6f12dd6d3 100644
--- a/src/spicelib/analysis/optran.c
+++ b/src/spicelib/analysis/optran.c
@@ -484,6 +484,7 @@ OPtran(CKTcircuit *ckt, int oldconverged)
         SPfrontEnd->IFerrorf(ERR_INFO, "Transient op finished successfully");
         ckt->CKTmaxStep = prevmaxstepsize;
         ckt->CKTstep = prevstepsize;
+        ckt->CKTag[0] = ckt->CKTag[1] = 0.;
         return(OK);
     }