1 files changed, 8 insertions, 3 deletions
diff --git a/tdutils/td/utils/BigNum.cpp b/tdutils/td/utils/BigNum.cpp
index b8c1290e7..3bfd10204 100644
--- a/tdutils/td/utils/BigNum.cpp
+++ b/tdutils/td/utils/BigNum.cpp
@@ -281,9 +281,14 @@ void BigNum::mod_mul(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumCon
   LOG_IF(FATAL, result != 1);
 }
 
-void BigNum::mod_inverse(BigNum &r, BigNum &a, const BigNum &m, BigNumContext &context) {
-  auto result = BN_mod_inverse(r.impl_->big_num, a.impl_->big_num, m.impl_->big_num, context.impl_->big_num_context);
-  LOG_IF(FATAL, result != r.impl_->big_num);
+Result<BigNum> BigNum::mod_inverse(BigNum &a, const BigNum &m, BigNumContext &context) {
+  BigNum r;
+  auto *result = BN_mod_inverse(r.impl_->big_num, a.impl_->big_num, m.impl_->big_num, context.impl_->big_num_context);
+  if (result != r.impl_->big_num) {
+    CHECK(result == nullptr);
+    return Status::Error("Failed to compute modulo inverse");
+  }
+  return std::move(r);
 }
 
 void BigNum::div(BigNum *quotient, BigNum *remainder, const BigNum &dividend, const BigNum &divisor,