diff --git a/crypto/ec/ec_mult.c b/crypto/ec/ec_mult.c
index 7320e31c5..a045139a0 100644
--- a/crypto/ec/ec_mult.c
+++ b/crypto/ec/ec_mult.c
@@ -879,7 +879,8 @@ int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
 
 	ret = 1;
  err:
-	BN_CTX_end(ctx);
+	if (ctx != NULL)
+		BN_CTX_end(ctx);
 	if (new_ctx != NULL)
 		BN_CTX_free(new_ctx);
 	if (pre_comp)