Fixed CreatureException not saving error string.

src/Core/Exceptions/CreatureException.hpp

@@ -8,7 +8,7 @@ class CreatureException : std::exception {
     std::string _error;
 
 public:
-    CreatureException(std::string error) {}
+    CreatureException(std::string error) : _error(error) {}
 
     const char* what() const noexcept override { return _error.c_str(); }
 };