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-rw-r--r--src/PJ_gn_sinu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/PJ_gn_sinu.c b/src/PJ_gn_sinu.c
index 745cd5ca..d13f2834 100644
--- a/src/PJ_gn_sinu.c
+++ b/src/PJ_gn_sinu.c
@@ -173,7 +173,7 @@ PJ *PROJECTION(gn_sinu) {
if (pj_param(P->ctx, P->params, "tn").i && pj_param(P->ctx, P->params, "tm").i) {
Q->n = pj_param(P->ctx, P->params, "dn").f;
Q->m = pj_param(P->ctx, P->params, "dm").f;
- if (Q->n < 0 || Q->m < 0)
+ if (Q->n <= 0 || Q->m < 0)
return destructor (P, PJD_ERR_INVALID_M_OR_N);
} else
return destructor (P, PJD_ERR_INVALID_M_OR_N);