diff --git a/crypto/util/Miner.cpp b/crypto/util/Miner.cpp
index 88d7d7df..1a770821 100644
--- a/crypto/util/Miner.cpp
+++ b/crypto/util/Miner.cpp
@@ -117,15 +117,21 @@ void Miner::write_stats(std::string filename, const ton::Miner::Options &options
   if (passed < 1e-9) {
     passed = 1;
   }
-  double speed = static_cast<double>(*options.hashes_computed) / passed;
+  double hashes_computed = options.hashes_computed ? static_cast<double>(*options.hashes_computed) : 0;
+  double speed = hashes_computed / passed;
   std::stringstream ss, ss2;
   ss << std::fixed << std::setprecision(3) << speed / 1e+6;
 
-  double instant_passed = *options.instant_passed;
+  double instant_passed = 1;
+  if (options.instant_passed) {
+    instant_passed = *options.instant_passed;
+  }
   if (instant_passed < 1e-9) {
     instant_passed = 1;
   }
-  double instant_speed = static_cast<double>(*options.instant_hashes_computed) / instant_passed;
+
+  double instant_hashes_computed = options.instant_hashes_computed ? static_cast<double>(*options.instant_hashes_computed) : 0;
+  double instant_speed = instant_hashes_computed / instant_passed;
   ss2 << std::fixed << std::setprecision(3) << instant_speed / 1e+6;
 
   td::JsonBuilder jb;
@@ -135,10 +141,10 @@ void Miner::write_stats(std::string filename, const ton::Miner::Options &options
   jo("seed", hex_encode(td::Slice(options.seed.data(), options.seed.size())));
   jo("complexity", hex_encode(td::Slice(options.complexity.data(), options.complexity.size())));
   jo("passed", std::to_string(passed));
-  jo("hashes_computed", std::to_string(*options.hashes_computed));
+  jo("hashes_computed", std::to_string(hashes_computed));
   jo("speed", ss.str());
   jo("instant_passed", std::to_string(instant_passed));
-  jo("instant_hashes_computed", std::to_string(*options.instant_hashes_computed));
+  jo("instant_hashes_computed", std::to_string(instant_hashes_computed));
   jo("instant_speed", ss2.str());
   jo.leave();
   auto s = jb.string_builder().as_cslice();
diff --git a/crypto/util/opencl/opencl.cpp b/crypto/util/opencl/opencl.cpp
index 7ecf3f80..a401e599 100644
--- a/crypto/util/opencl/opencl.cpp
+++ b/crypto/util/opencl/opencl.cpp
@@ -36,7 +36,7 @@ void OpenCL::set_source(unsigned char *source, unsigned int length) {
   }
 }
 
-void OpenCL::print_devices(bool count) {
+void OpenCL::print_devices() {
   cl_int cl_err = CL_SUCCESS;
 
   // platform
@@ -59,7 +59,7 @@ void OpenCL::print_devices(bool count) {
     CL_WRAPPER(clGetDeviceIDs(platforms_[p], CL_DEVICE_TYPE_ALL, device_count_, devices_, NULL));
     for (uint i = 0; i < device_count_; i++) {
       CL_WRAPPER(clGetDeviceInfo(devices_[i], CL_DEVICE_NAME, sizeof(buf), buf, NULL));
-      if (!count && GET_VERBOSITY_LEVEL() >= VERBOSITY_NAME(INFO)) {
+      if (GET_VERBOSITY_LEVEL() >= VERBOSITY_NAME(INFO)) {
         LOG(PLAIN) << "[ OpenCL: platform #" << p << " device #" << i << " " << buf << " ]";
       }
       num_devices_++;
diff --git a/crypto/util/opencl/opencl.h b/crypto/util/opencl/opencl.h
index 4eed9d1d..ea535196 100644
--- a/crypto/util/opencl/opencl.h
+++ b/crypto/util/opencl/opencl.h
@@ -27,7 +27,7 @@ class OpenCL {
   OpenCL() = default;
   void load_source(const char *filename);
   void set_source(unsigned char *source, unsigned int length);
-  void print_devices(bool count = false);
+  void print_devices();
   int get_num_devices();
   void create_context(cl_uint platform_idx, cl_uint device_idx);
   void create_kernel();
diff --git a/crypto/util/pow-miner-howto.md b/crypto/util/pow-miner-howto.md
index 90fac383..7f7e6974 100644
--- a/crypto/util/pow-miner-howto.md
+++ b/crypto/util/pow-miner-howto.md
@@ -115,7 +115,7 @@ It will save the data in the following format:
 {"timestamp":"1637264251.112240","giver":"Ef-FV4QTxLl-7Ct3E6MqOtMt-RGXMxi27g4I645lw6MTWg0f","seed":"B2A077AA6FCFE63FB0C8AAAEE1397A49","complexity":"000000000000E3C331D02EA44D1582443748E77D3997E69B37C5FD95D818D972","passed":"44.829463","hashes_computed":"13740539904","speed":"306.507","instant_passed":"4.981751","instant_hashes_computed":"1275068416","instant_speed":"255.948"}
 ```
 
-Log rotation is an automated process. To force rotate logs send the HANGUP to the tonlib-*-cli process. Log rotate threshold is 1Mb.
+Log rotation is an automated process. To force rotate logs send the HANGUP to the tonlib-*-cli process. Log rotate threshold is 1MB.
 
 ## TONLIB CLI automation
 
diff --git a/crypto/util/pow-miner.cpp b/crypto/util/pow-miner.cpp
index 0362ed1f..ebe0942e 100644
--- a/crypto/util/pow-miner.cpp
+++ b/crypto/util/pow-miner.cpp
@@ -325,7 +325,7 @@ int main(int argc, char* const argv[]) {
 
 #if defined MINEROPENCL
   auto opencl = opencl::OpenCL();
-  opencl.print_devices(true);
+  opencl.print_devices();
   if (opencl.get_num_devices() == 0) {
     std::cerr << "No OpenCL-capable devices is detected!" << std::endl;
     exit(1);
diff --git a/tonlib/tonlib/tonlib-cli.cpp b/tonlib/tonlib/tonlib-cli.cpp
index 493ce0a8..5256283b 100644
--- a/tonlib/tonlib/tonlib-cli.cpp
+++ b/tonlib/tonlib/tonlib-cli.cpp
@@ -724,7 +724,7 @@ class TonlibCli : public td::actor::Actor {
         next_options_query_at_ = {};
 
         // show status
-        if (miner_options_copy_.verbosity >= 2) {
+        if (miner_options_copy_.verbosity >= 2 && options_.giver_address.address) {
           ton::Miner::print_stats("mining in progress", miner_options_copy_.start_at, hashes_computed_,
                                   instant_passed_, instant_hashes_computed_);
           ton::Miner::write_stats(options_.statfile, miner_options_copy_,
@@ -2698,7 +2698,7 @@ int main(int argc, char* argv[]) {
   });
   p.add_option('l', "logname", "log to file", [&](td::Slice fname) {
     options.logfile = fname.str();
-    // 1 Mb log threshold
+    // 1MB log threshold
     logger_ = td::TsFileLog::create(fname.str(), 1 * (1 << 20), true, true).move_as_ok();
     td::set_signal_handler(td::SignalType::HangUp, force_rotate_logs).ensure();
     td::log_interface = logger_.get();