diff --git a/src/grib_geography.cc b/src/grib_geography.cc
index b385ceb10..0493f8549 100644
--- a/src/grib_geography.cc
+++ b/src/grib_geography.cc
@@ -4003,6 +4003,8 @@ static int ecc_grib_get_gaussian_latitudes(long trunc, double* lats)
 
 int grib_get_gaussian_latitudes(long trunc, double* lats)
 {
+    if (trunc == 0)
+        return GRIB_GEOCALCULUS_PROBLEM;
     if (trunc == 1280)
         return get_precomputed_latitudes_N1280(lats);
     if (trunc == 640)
diff --git a/src/grib_iterator_class_gaussian.cc b/src/grib_iterator_class_gaussian.cc
index 7042b6233..20807be96 100644
--- a/src/grib_iterator_class_gaussian.cc
+++ b/src/grib_iterator_class_gaussian.cc
@@ -129,7 +129,7 @@ static int init(grib_iterator* i, grib_handle* h, grib_arguments* args)
     ret = grib_get_gaussian_latitudes(trunc, lats);
 
     if (ret != GRIB_SUCCESS) {
-        grib_context_log(h->context, GRIB_LOG_ERROR, "error %d calculating gaussian points", ret);
+        grib_context_log(h->context, GRIB_LOG_ERROR, "Error calculating gaussian points: %s", grib_get_error_message(ret));
         return ret;
     }
     /*