diff --git a/src/strings.cpp b/src/strings.cpp
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -799,6 +799,9 @@ uint ConvertDisplaySpeedToKmhishSpeed(ui
 {
 	return _units_velocity[_settings_game.locale.units_velocity].c.FromDisplay(speed * 16, true, 10);
 }
+
+static std::vector<const char *> _game_script_raw_strings;
+
 /**
  * Parse most format codes within a string and write the result to a buffer.
  * @param buff    The buffer to write the final string to.
@@ -932,6 +935,7 @@ static char *FormatString(char *buff, co
 
 						sub_args_need_free[i] = true;
 						sub_args.SetParam(i++, (uint64)(size_t)g);
+						_game_script_raw_strings.push_back(g);
 					}
 				}
 				/* If we didn't error out, we can actually print the string. */
@@ -941,7 +945,10 @@ static char *FormatString(char *buff, co
 				}
 
 				for (i = 0; i < 20; i++) {
-					if (sub_args_need_free[i]) free((void *)sub_args.GetParam(i));
+					if (sub_args_need_free[i]) {
+						free((void *)sub_args.GetParam(i));
+						_game_script_raw_strings.pop_back();
+					}
 				}
 				break;
 			}
@@ -1046,6 +1053,10 @@ static char *FormatString(char *buff, co
 
 			case SCC_RAW_STRING_POINTER: { // {RAW_STRING}
 				const char *raw_string = (const char *)(size_t)args->GetInt64(SCC_RAW_STRING_POINTER);
+				if (game_script && std::find(_game_script_raw_strings.begin(), _game_script_raw_strings.end(), raw_string) == _game_script_raw_strings.end()) {
+					buff = strecat(buff, "(invalid RAW_STRING parameter)", last);
+					break;
+				}
 				buff = FormatString(buff, raw_string, args, last);
 				break;
 			}