Arduino isue WeMos D1 and Firebase, Exception (28)

I'm having an error with the arduino WeMos D1 Wifi. When I'm trying to get for 60th time the value of the data from realtime Firebase, I get an error.

   Exception (28):
epc1=0x4020b95c epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000034 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffc60 end: 3fffffc0 offset: 01a0
3ffffe00:  0000000b 3ffeec68 3ffefec8 402062d4  
3ffffe10:  3ffe87ae 000001bb 3ffefec8 402071ac  
3ffffe20:  3ffe8862 0000003b 3ffefec8 402075d8  
3ffffe30:  0000003b 3ffeec68 0000002e 402025d8  
3ffffe40:  3ffffe88 0000003b 3ffffe70 40207f68  
3ffffe50:  3ffeec64 3ffffe70 3ffe8862 3ffffef0  
3ffffe60:  3ffeec64 3ffffeb4 3ffefec4 40203eab  
3ffffe70:  3fff28fc 003b003f 00fffeb4 3fff0154  
3ffffe80:  0049004f 00fefc44 3ffeff5c 0017001f  
3ffffe90:  00000000 0000008e 3ffefc59 3ffffef0  
3ffffea0:  3ffeec64 3ffe87df 3ffefd0c 40201c08  
3ffffeb0:  00000000 3ffeff98 00000001 3ffeed58  
3ffffec0:  3fffff6c 3ffffef0 3ffe87f8 4020259c  
3ffffed0:  3ffffef8 00000020 3fffff6c 3ffeed58  
3ffffee0:  3fffff6c 3ffefd0c 3ffeec60 40202e8d  
3ffffef0:  3ffeeca0 3ffefd58 010624dd 00000000  
3fffff00:  3fffdad0 3ffeec60 3fffff60 40202ece  
3fffff10:  3ffe8780 00000015 3fffff6c 40207f1f  
3fffff20:  00000015 3ffeecdc 3ffe88f6 4020791d  
3fffff30:  01361c21 00000015 3fffff6c 40207f68  
3fffff40:  3fffdad0 3fffff6c 3ffe8780 40207f9e  
3fffff50:  3fffdad0 00000000 3ffeeb58 4020153e  
3fffff60:  007a1200 476575e7 80feeb00 3ffefc44  
3fffff70:  0015001f 00000000 3ffeeb00 402013f8  
3fffff80:  00000000 00000000 00000001 401003a4  
3fffff90:  3fffdad0 00000000 3ffeed18 3ffeed58  
3fffffa0:  3fffdad0 00000000 3ffeed18 40208e44  
3fffffb0:  feefeffe feefeffe 3ffe8568 40101001  
<<<stack<<<

I search information, but I dindn't fint anything relevant to my error.

The loop code is this;

void loop() {

 // SUBIDA DE DATOS DE DHT11
  if ((millis() - temp) >= 3600) { // CADA 1 MIN
    humedad = dht.readHumidity(); // ESCANEA LA HUMEDAD EN %
    temperatura = dht.readTemperature(); // ESCANEA LA TEMPERATURA EN ºC
    Serial.println("LEE DHT11");
    Firebase.setInt(ruta + "humedad", humedad); // SUBE LA HUMEDAD A FIREBASE
    Firebase.setInt(ruta + "temperatura", temperatura); // SUBE LA TEMPERATURA A FIREBASE
    temp = millis(); // REINICIA EL CHEQUEO
  } else {
    temp = millis(); // SUMA 1 AL CHEQUEO
  }


  // CONTROL DE LEDS


    if(millis() - color.temp >= 500){
        color.newC = Firebase.getString("domotica/WeMos1/color"); // RECIBE EL COLOR DE FIREBASE
        test=test+1;
        //Serial.println(color.newC);
        if (color.newC != color.oldC){
          color.oldC[0] = '\0';
          color.oldC = color.newC;
          color.newC = '#' + color.newC; // AGREGA LA ALHMOADIA AL STRING HEX
          color.number = (long) strtol( &color.newC[1], NULL, 16); // CONVIERTE LA STRING HEX EN UN HEX
          color.r = color.number >> 16; // VALOR ROJO
          color.g = color.number >> 8 & 0xFF; // VALOR VERDE
          color.b = color.number & 0xFF; // VALOR AZUL
          color.newC[0] = '\0';
          Serial.println("modified");
          for (int i = 0; i < NUM_LEDS; i++) { // EMPIEZA UNA LOOP PARA PONER EL COLOR A TODOS LOS LEDS
            leds[i].setRGB(color.r, color.g, color.b); // PONE EL COLOR AL LED "I"
            }  FastLED.show(); // ACTUALIZA EL LED Y COLOCA LOS COLORES
        } color.temp = millis();
          Serial.println(test);
    }



  //for(int i = 0;i <5; i++){Firebase.setInt("Teo", i);delay(200);}



}

I think maybe the cause is too fast request one behind other in an interval of 500ms.

Decoding this I get this output:

Exception 28: LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads
PC: 0x4020b95c: HTTPClient::connected() at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\libraries\ESP8266HTTPClient\src\ESP8266HTTPClient.cpp line 472
EXCVADDR: 0x00000034

Decoding stack results
0x402062d4: HTTPClient::disconnect(bool) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\libraries\ESP8266HTTPClient\src\ESP8266HTTPClient.cpp line 435
0x402071ac: HTTPClient::end() at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\libraries\ESP8266HTTPClient\src\ESP8266HTTPClient.cpp line 425
0x402075d8: HTTPClient::begin(String, unsigned short, String, String) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\libraries\ESP8266HTTPClient\src\ESP8266HTTPClient.cpp line 379
0x402025d8: std::string::_Rep::_M_destroy(std::allocator  const&) at c:\users\teoda\documents\arduinodata\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-4-b40a506\xtensa-lx106-elf\include\c++\4.8.2\bits/basic_string.tcc line 452
0x40207f68: String::copy(char const*, unsigned int) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266\WString.cpp line 214
0x40203eab: FirebaseHttpClientEsp8266::begin(std::string const&, std::string const&) at C:\Users\teoda\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseHttpClient_Esp8266.cpp line 51
0x40201c08: FirebaseRequest::sendRequest(std::string const&, std::string const&, char*, std::string const&, std::string const&) at C:\Users\teoda\Documents\Arduino\libraries\firebase-arduino-master\src\Firebase.cpp line 73
0x4020259c: std::basic_string  , std::allocator  >::basic_string(char const*, std::allocator  const&) at c:\users\teoda\documents\arduinodata\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-4-b40a506\xtensa-lx106-elf\include\c++\4.8.2\bits/basic_string.tcc line 218
0x40202e8d: FirebaseArduino::getRequest(String const&) at C:\Users\teoda\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp line 101
0x40202ece: FirebaseArduino::getString(String const&) at C:\Users\teoda\Documents\Arduino\libraries\firebase-arduino-master\src\FirebaseArduino.cpp line 132
0x40207f1f: String::reserve(unsigned int) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266\WString.cpp line 146
0x4020791d: Print::write(char const*) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266/Print.h line 60
0x40207f68: String::copy(char const*, unsigned int) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266\WString.cpp line 214
0x40207f9e: String::String(char const*) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266\WString.cpp line 36
0x4020153e: loop() at C:\Users\teoda\Documents\Domotica/Domotica.ino line 104
0x402013f8: setup() at C:\Users\teoda\Documents\Domotica/Domotica.ino line 81
0x401003a4: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266\core_esp8266_main.cpp line 159
0x40208e44: loop_wrapper() at C:\Users\teoda\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.6.0\cores\esp8266\core_esp8266_main.cpp line 179

You declare your leds array as an array with 30 elements (0 to 29) ... and in this for - loop

for (int i = 0; i < NUM_LEDS + 1; i++)

you access leds[30] which is out of bounds ... change your for - loop to

for (int i = 0; i < NUM_LEDS; i++)

and it should work.