Fix for Damage Evaluation

//=============================================================================
// Bug Fix - Fix Damage Evaluation returning Not-A-Number.
// DamageEvalNotANumberFix.js
// Version: 1.0
//=============================================================================

//=============================================================================
 /*:
 * @plugindesc Fixes an issue when evaluating damage formulas that would return
 * value of NaN when no damage formula is entered. Thus fixing a bug that would
 * cause a crash/exception when attempting to draw the hp/mp gauges.
 * @author Liquidize
 */
//=============================================================================

(function() {

// Overwrites the damage evaluation function to include checking if the returned value is Not-a-Number.
Game_Action.prototype.evalDamageFormula = function(target) {
    try {
        var item = this.item();
        var a = this.subject();
        var b = target;
        var v = $gameVariables._data;
        var sign = ([3, 4].contains(item.damage.type) ? -1 : 1);
        var value = Math.max(eval(item.damage.formula), 0) * sign;

        if (Number.isNaN(value)) {
            return 0;
        }
        return value;
    } catch (e) {
        return 0;
    }
};

})();