diff --git a/src/classes/PMsr2Data.cpp b/src/classes/PMsr2Data.cpp
index 24c9110c..f9bbd177 100644
--- a/src/classes/PMsr2Data.cpp
+++ b/src/classes/PMsr2Data.cpp
@@ -1308,7 +1308,9 @@ bool PMsr2Data::PrepareGlobalInputFile(unsigned int tempRun, const std::string &
       std::ostringstream oss;
       oss << path << "musrfit" << " " << *fRunVectorIter << "-OneRunFit" << fFileExtension << ".msr";
       std::cout << std::endl << ">> msr2data: **INFO** Calling " << oss.str() << std::endl;
-      system(oss.str().c_str());
+      if (system(oss.str().c_str()) == -1) {
+        std::cerr << std::endl << "**ERROR** system call: " << oss.str().c_str() << " failed." << std::endl;
+      }
 
       ++fRunVectorIter;
     }
diff --git a/src/classes/PRunDataHandler.cpp b/src/classes/PRunDataHandler.cpp
index c0503e0f..4ef8c6bc 100644
--- a/src/classes/PRunDataHandler.cpp
+++ b/src/classes/PRunDataHandler.cpp
@@ -724,7 +724,9 @@ Bool_t PRunDataHandler::ReadWriteFilesList()
         sprintf(cmd, "tar -zcf %s %s", fln.Data(), fAny2ManyInfo->outPathFileName[0].Data());
       else // bzip2
         sprintf(cmd, "tar -jcf %s %s", fln.Data(), fAny2ManyInfo->outPathFileName[0].Data());
-      system(cmd);
+      if (system(cmd) == -1) {
+        std::cerr << "**ERROR** cmd: " << cmd << " failed." << std::endl;
+      }
     } else {
       fln += TString(".tar");
       for (UInt_t i=0; i<fAny2ManyInfo->outPathFileName.size(); i++) {
@@ -733,7 +735,9 @@ Bool_t PRunDataHandler::ReadWriteFilesList()
         } else {
           sprintf(cmd, "tar -rf %s %s", fln.Data(), fAny2ManyInfo->outPathFileName[i].Data());
         }
-        system(cmd);
+        if (system(cmd) == -1) {
+          std::cerr << "**ERROR** cmd: " << cmd << " failed." << std::endl;
+        }
       }
       if (fAny2ManyInfo->compressionTag == 1) { // gzip
         sprintf(cmd, "gzip %s", fln.Data());
@@ -742,7 +746,9 @@ Bool_t PRunDataHandler::ReadWriteFilesList()
         sprintf(cmd, "bzip2 -z %s", fln.Data());
         fln += ".bz2";
       }
-      system(cmd);
+      if (system(cmd) == -1) {
+        std::cerr << "**ERROR** cmd: " << cmd << " failed." << std::endl;
+      }
     }
 
     // check if the compressed file shall be streamed to the stdout
diff --git a/src/msr2data.cpp b/src/msr2data.cpp
index 0fb7a621..e61e6eb6 100644
--- a/src/msr2data.cpp
+++ b/src/msr2data.cpp
@@ -893,7 +893,9 @@ int main(int argc, char *argv[])
         std::ostringstream oss;
         oss << path << "musrfit" << " " << strInfile.str() << " " << musrfitOptions;
         std::cout << std::endl << ">> msr2data: **INFO** Calling " << oss.str() << std::endl;
-        system(oss.str().c_str());
+        if (system(oss.str().c_str()) == -1) {
+          std::cerr << "**ERROR** cmd: " << oss.str().c_str() << " failed." << std::endl;
+        }
       }
     }
 
@@ -982,7 +984,9 @@ int main(int argc, char *argv[])
           std::ostringstream oss;
           oss << path << "musrfit" << " " << strInfile.str() << " " << musrfitOptions;
           std::cout << std::endl << ">> msr2data: **INFO** Calling " << oss.str() << std::endl;
-          system(oss.str().c_str());
+          if (system(oss.str().c_str()) == -1) {
+            std::cerr << "**ERROR** cmd: " << oss.str().c_str() << " failed." << std::endl;
+          }
         }
       }
 
diff --git a/src/msr2msr.cpp b/src/msr2msr.cpp
index 03ef1c49..99b5ef02 100644
--- a/src/msr2msr.cpp
+++ b/src/msr2msr.cpp
@@ -574,10 +574,16 @@ bool msr2msr_finalize_theory(char *fln, int theoryTag, int noOfAddionalParams)
 
   // cp __temp.msr fln
   sprintf(str, "cp __temp.msr %s", fln);
-  system(str);
+  if (system(str) == -1) {
+    std::cerr << "**ERROR** cmd: " << str << " failed." << std::endl;
+    return false;
+  }
   // rm __temp.msr
   strcpy(str, "rm __temp.msr");
-  system(str);
+  if (system(str) == -1) {
+    std::cerr << "**ERROR** cmd: " << str << " failed." << std::endl;
+    return false;
+  }
 
   return true;
 }
@@ -704,7 +710,10 @@ int main(int argc, char *argv[])
   // check if conversion seems to be OK
   if (!success) {
     sprintf(str, "rm -rf %s", argv[2]);
-    system(str);
+    if (system(str) == -1) {
+      std::cerr << "**ERROR** cmd: " << str << " failed." << std::endl;
+      return 0;
+    }
   }
 
   if (theoryTag != -1) {
diff --git a/src/musredit_qt5/musredit/PDumpOutputHandler.cpp b/src/musredit_qt5/musredit/PDumpOutputHandler.cpp
index 5e310333..29c90648 100644
--- a/src/musredit_qt5/musredit/PDumpOutputHandler.cpp
+++ b/src/musredit_qt5/musredit/PDumpOutputHandler.cpp
@@ -123,7 +123,14 @@ PDumpOutputHandler::~PDumpOutputHandler()
 #else
     qDebug() << msg << Qt::endl;
 #endif
-    system(cmd.toLatin1());
+    if (system(cmd.toLatin1()) == -1) {
+#if (QT_VERSION < QT_VERSION_CHECK(5, 14, 0))
+      qDebug() << "**ERROR** " << msg << " failed." << endl;
+#else
+      qDebug() << "**ERROR** " << msg << " failed." << Qt::endl;
+#endif
+
+    }
   }
   if (fProc) {
     delete fProc;
diff --git a/src/musredit_qt5/musredit/PFitOutputHandler.cpp b/src/musredit_qt5/musredit/PFitOutputHandler.cpp
index bdfe737e..d31bd8cc 100644
--- a/src/musredit_qt5/musredit/PFitOutputHandler.cpp
+++ b/src/musredit_qt5/musredit/PFitOutputHandler.cpp
@@ -126,7 +126,13 @@ PFitOutputHandler::~PFitOutputHandler()
 #else
     qDebug() << msg << Qt::endl;
 #endif
-    system(cmd.toLatin1());
+    if (system(cmd.toLatin1()) == -1) {
+#if (QT_VERSION < QT_VERSION_CHECK(5, 14, 0))
+      qDebug() << "**ERROR** " << msg << " - failed!" << endl;
+#else
+      qDebug() << "**ERROR** " << msg << " - failed!" << Qt::endl;
+#endif
+    }
   }
   if (fProc) {
     delete fProc;