diff --git a/src/parallel b/src/parallel
index a4d044f1..2b1d2447 100755
--- a/src/parallel
+++ b/src/parallel
@@ -167,7 +167,8 @@ if($opt::halt and $Global::halt_when ne "never") {
 	    $Global::halt_exitstatus =
 		::ceil($Global::total_failed / $Global::total_started * 100);
 	} elsif($Global::halt_count) {
-	    $Global::halt_exitstatus = ::min($Global::total_failed,101);
+	    $Global::halt_exitstatus =
+		::min(undef_as_zero($Global::total_failed),101);
 	}
     }
     wait_and_exit($Global::halt_exitstatus);
diff --git a/testsuite/tests-to-run/parallel-local-0.3s.sh b/testsuite/tests-to-run/parallel-local-0.3s.sh
index 7def4be6..625e8461 100644
--- a/testsuite/tests-to-run/parallel-local-0.3s.sh
+++ b/testsuite/tests-to-run/parallel-local-0.3s.sh
@@ -17,6 +17,12 @@ export SMALLDISK
 ) >/dev/null 2>/dev/null
 
 cat <<'EOF' | sed -e 's/;$/; /;s/$SERVER1/'$SERVER1'/;s/$SERVER2/'$SERVER2'/' | stdout parallel -vj0 -k --joblog /tmp/jl-`basename $0` -L1
+echo '### Test bug #45619: "--halt" erroneous error exit code (should give 0)'; 
+  seq 10 | parallel --halt now,fail=1 true; 
+  echo $?
+
+echo '**'
+
 echo '### Test exit val - true'; 
   echo true | parallel; 
   echo $?
diff --git a/testsuite/wanted-results/parallel-local-0.3s b/testsuite/wanted-results/parallel-local-0.3s
index 475d5db7..91a0399e 100644
--- a/testsuite/wanted-results/parallel-local-0.3s
+++ b/testsuite/wanted-results/parallel-local-0.3s
@@ -1,3 +1,8 @@
+echo '### Test bug #45619: "--halt" erroneous error exit code (should give 0)';   seq 10 | parallel --halt now,fail=1 true;   echo $?
+### Test bug #45619: "--halt" erroneous error exit code (should give 0)
+0
+echo '**'
+**
 echo '### Test exit val - true';   echo true | parallel;   echo $?
 ### Test exit val - true
 0