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# upstream bug https://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=2441
# will be fixed in 2.15.3
diff --git a/src/basemath/ellsea.c b/src/basemath/ellsea.c
index a6871fa6a7..f1e725ea55 100644
--- a/src/basemath/ellsea.c
+++ b/src/basemath/ellsea.c
@@ -1303,6 +1303,7 @@ find_trace_Elkies_power(GEN a4, GEN a6, ulong ell, long *pt_k, struct meqn *MEQN
lambda = tr ? find_eigen_value_oneroot(a4, a6, ell, tr, kpoly, T, p):
find_eigen_value_power(a4, a6, ell, 1, 1, kpoly, T, p);
if (DEBUGLEVEL>1) err_printf(" [%ld ms]", timer_delay(ti));
+ if (lambda==ell) return NULL;
if (smallfact && smallfact%(long)ell!=0)
{
ulong pell = pellk%ell;
@@ -1317,6 +1318,7 @@ find_trace_Elkies_power(GEN a4, GEN a6, ulong ell, long *pt_k, struct meqn *MEQN
if (!tmp) { k = cnt-1; break; }
if (DEBUGLEVEL) err_printf(", %Ps", powuu(ell, cnt));
lambda = find_eigen_value_power(a4, a6, ell, cnt, lambda, gel(tmp,3), T, p);
+ if (lambda == upowuu(ell, cnt)) { k = cnt-1; break; }
Eba4 = Eca4;
Eba6 = Eca6;
Eca4 = gel(tmp,1);
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