Merge pull request #11601 from filimonov/fix_client_exit_code

Fix corner case (only) for exit code overflow

programs/client/Client.cpp

@@ -1920,7 +1920,11 @@ class Client : public Poco::Util::Application
                 std::string text = e.displayText();
                 std::cerr << "Code: " << e.code() << ". " << text << std::endl;
                 std::cerr << "Table №" << i << std::endl << std::endl;
-                exit(e.code());
+                /// Avoid the case when error exit code can possibly overflow to normal (zero).
+                auto exit_code = e.code() % 256;
+                if (exit_code == 0)
+                    exit_code = 255;
+                exit(exit_code);
             }
         }