diff --git a/src/cpp/lpnamer/helper/common_lpnamer.h b/src/cpp/lpnamer/helper/common_lpnamer.h
index fac4f9969..883670121 100644
--- a/src/cpp/lpnamer/helper/common_lpnamer.h
+++ b/src/cpp/lpnamer/helper/common_lpnamer.h
@@ -50,6 +50,9 @@ inline std::vector<std::string> split(const std::string& original,
 
 inline FILE* OpenLogPtr(const std::filesystem::path& log_file) {
   FILE* log_file_ptr = NULL;
+  if (log_file.empty()) {
+    return log_file_ptr;
+  }
 #ifdef __linux__
   if ((log_file_ptr = fopen(log_file.string().c_str(), "a+")) == nullptr)
 #elif _WIN32
diff --git a/src/cpp/multisolver_interface/SolverCbc.cpp b/src/cpp/multisolver_interface/SolverCbc.cpp
index 4d8c7c74e..24c7b60f0 100644
--- a/src/cpp/multisolver_interface/SolverCbc.cpp
+++ b/src/cpp/multisolver_interface/SolverCbc.cpp
@@ -73,9 +73,11 @@ SolverCbc::~SolverCbc() {
 }
 
 void SolverCbc::set_fp(FILE *fp) {
-  setvbuf(fp, nullptr, _IONBF, 0);
-  _clp_inner_solver.messageHandler()->setFilePointer(fp);
-  _cbc.messageHandler()->setFilePointer(fp);
+  if (fp) {
+    setvbuf(fp, nullptr, _IONBF, 0);
+    _clp_inner_solver.messageHandler()->setFilePointer(fp);
+    _cbc.messageHandler()->setFilePointer(fp);
+  }
 }
 
 int SolverCbc::get_number_of_instances() { return _NumberOfProblems; }
diff --git a/src/cpp/multisolver_interface/SolverClp.cpp b/src/cpp/multisolver_interface/SolverClp.cpp
index d675a027b..2c3fc43c1 100644
--- a/src/cpp/multisolver_interface/SolverClp.cpp
+++ b/src/cpp/multisolver_interface/SolverClp.cpp
@@ -70,8 +70,10 @@ SolverClp::~SolverClp() {
 }
 
 void SolverClp::set_fp(FILE *fp) {
-  setvbuf(_fp, nullptr, _IONBF, 0);
-  _clp.messageHandler()->setFilePointer(_fp);
+  if (fp) {
+    setvbuf(_fp, nullptr, _IONBF, 0);
+    _clp.messageHandler()->setFilePointer(_fp);
+  }
 }
 
 int SolverClp::get_number_of_instances() { return _NumberOfProblems; }