Fatal error: Call to a member function getPriority() on null in C:\xampp\htdocs\math\vendor\nxp\math-executor\src\NXP\Classes\Lexer.php on line 107

[falinhares]

I've installed math-executor through Composer, ran some tests on the first code and came to this issue:

Code:
require "vendor/autoload.php";
$calculator = new \NXP\MathExecutor();
print $calculator->execute("1 + 2 * (2 - (4+10))^2 + sin(10)");
print $calculator->execute("(4+10)^2");
Output:
-19.544021110889
Notice: Undefined offset: -1 in C:\xampp\htdocs\math\vendor\nxp\math-executor\src\NXP\Classes\Lexer.php on line 107

Fatal error: Call to a member function getPriority() on null in C:\xampp\htdocs\math\vendor\nxp\math-executor\src\NXP\Classes\Lexer.php on line 107

How can I fix this?

[zRosenthal]

Hello falinhares, there are some bugs when using a lot of parentheses. I would suggest using the following package, Executor

[falinhares]

but the expression delivering the error is (4+10)^2