diff --git a/src/sharedspice.c b/src/sharedspice.c
index 839db8c43..97cde9730 100644
--- a/src/sharedspice.c
+++ b/src/sharedspice.c
@@ -1884,7 +1884,7 @@ int sh_ExecutePerLoop(void)
     /* get the data of the last entry to the plot vector */
     veclen = pl->pl_dvecs->v_length - 1;
     /* safeguard against vectors with 0 length (e.g. @c1[i] during ac simulation) */
-    if (veclen < 1)
+    if (veclen < 0)
         return 2;
     curvecvalsall->vecindex = veclen;
     for (d = pl->pl_dvecs, i = 0; d; d = d->v_next, i++) {