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Why is this an issue?

  Passing an invalid format string to System.SysUtils.Format
  can raise a runtime exception. In addition, even if an exception is not raised
  Format stops processing the string after the first invalid
  character, which will result in an unexpected value.

How to fix it

  Modify the format string to be syntactically valid.


  For example, if there are stray percent symbols, escape them with a second percent symbol:

Format('%s got 50%!', ['Bob']);

Format('%s got 50%%!', ['Bob']);


  Or if there is a mangled format specifier, fix the syntax problems:

Format('%s got %*:*f!', ['Bob', 2, 50.0]);

Format('%s got %.*f!', ['Bob', 2, 50.0]);

Resources

  
    
      RAD Studio API documentation: System.SysUtils.Format