diff --git a/main.cpp b/main.cpp
index b78bfe9..c117d86 100644
--- a/main.cpp
+++ b/main.cpp
@@ -171,6 +171,10 @@ int main(int argc, char *argv[])
             if (likely(!envExecutable.isEmpty())) {
                 executable = QString::fromUtf8(envExecutable);
             }
+            else {
+                QTextStream(stderr) << "Executable is not defined in environment, aborting!" << smsub_endl;
+                return 1;
+            }
 
             if (likely(!envArguments.isEmpty())) {
                 argumentList = parseStringArguments(QString::fromUtf8(envArguments));
@@ -179,6 +183,10 @@ int main(int argc, char *argv[])
                     return 1;
                 }
             }
+            else {
+                QTextStream(stderr) << "Arguments are not defined in environment, aborting!" << smsub_endl;
+                return 1;
+            }
         }
 
         if (unlikely(!envTimeout.isEmpty())) {