Screeps renew bug

main.js

var roleHarvester = {
    run: function(creep) {
        if(creep.carry.energy < creep.carryCapacity) {
            var sources = creep.room.find(FIND_SOURCES);
            if(creep.harvest(sources[0]) == ERR_NOT_IN_RANGE) {
                creep.moveTo(sources[0], {visualizePathStyle: {stroke: '#ffaa00'}});
            }
        }
        else {
            var targets = creep.room.find(FIND_STRUCTURES, {
                filter: (structure) => {
                    return (structure.structureType == STRUCTURE_EXTENSION || structure.structureType == STRUCTURE_SPAWN) &&
                        structure.energy < structure.energyCapacity;
                }
            });
            if(targets.length > 0) {
                if(creep.transfer(targets[0], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
                    creep.moveTo(targets[0], {visualizePathStyle: {stroke: '#ffffff'}});
                }
            }
        }
    }
};

function renewCreep(creep) {
    // BUG IS TRIGGERED HERE
    var output = Game.spawns['Spawn1'].renewCreep(creep);
    if(output === ERR_NOT_IN_RANGE) {
        creep.moveTo(Game.spawns['Spawn1'], {visualizePathStyle: {stroke: '#ffffff'}});
    }
}

module.exports.loop = function () {

    for(var name in Memory.creeps) {
        if(!Game.creeps[name]) {
            delete Memory.creeps[name];
            console.log('Clearing non-existing creep memory:', name);
        }
    }

    var harvesters = _.filter(Game.creeps, (creep) => creep.memory.role == 'harvester');
    console.log('Harvesters: ' + harvesters.length);

    if(harvesters.length < 5) {
        var newName = Game.spawns['Spawn1'].createCreep([WORK,CARRY,MOVE], undefined, {role: 'harvester'});
        console.log('Spawning new harvester: ' + newName);
    }

    if(Game.spawns['Spawn1'].spawning) {
        var spawningCreep = Game.creeps[Game.spawns['Spawn1'].spawning.name];
        Game.spawns['Spawn1'].room.visual.text(
            '🛠️' + spawningCreep.memory.role,
            Game.spawns['Spawn1'].pos.x + 1,
            Game.spawns['Spawn1'].pos.y,
            {align: 'left', opacity: 0.8});
    }

    for(var name in Game.creeps) {
        var creep = Game.creeps[name];
        if(creep.ticksToLive < 1400) {
            renewCreep(creep);
        } else {
            if(creep.memory.role == 'harvester') {
                roleHarvester.run(creep);
            }
        }
    }
}