Random crash when making SSL connection.

[HW-Siew]

Hi, I experienced some random crashes when trying to establish a SSL connection using NodeMCU.
The following are the decoded error message. I dont really understand what went wrong. Any advice are very much appreciated. Thank you.

0x4022fddf: basic_read at /Users/igrokhotkov/e/axtls/e1/ssl/tls1.c line 1224
0x401006d8: malloc at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266\umm_malloc/umm_malloc.c line 1658
0x4022fc7a: DISPLAY_ALERT at /Users/igrokhotkov/e/axtls/e1/ssl/tls1.c line 2178 (discriminator 3)
:  (inlined by) send_alert at /Users/igrokhotkov/e/axtls/e1/ssl/tls1.c line 1593 (discriminator 3)
0x402301c5: ssl_read at /Users/igrokhotkov/e/axtls/e1/ssl/tls1.c line 266
0x4020a770: optimistic_yield at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266/core_esp8266_main.cpp line 43
0x4022fcd6: ssl_free at /Users/igrokhotkov/e/axtls/e1/ssl/tls1.c line 236
0x40206732: ~SSLContext at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\libraries\ESP8266WiFi\src/WiFiClientSecure.cpp line 471
:  (inlined by) SSLContext::unref() at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\libraries\ESP8266WiFi\src/WiFiClientSecure.cpp line 92
0x40206dd0: WiFiClientSecure::stop() at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\libraries\ESP8266WiFi\src/WiFiClientSecure.cpp line 337
0x40209d15: PubSubClient::connect(char const*, char const*, char const*, char const*, unsigned char, unsigned char, char const*, bool) at C:\Users\HW\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.cpp line 629
0x4020bc21: Print::printNumber(unsigned long, unsigned char) at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266/Print.cpp line 226
0x40209d4c: PubSubClient::connect(char const*, char const*, char const*, bool) at C:\Users\HW\Documents\Arduino\libraries\PubSubClient\src/PubSubClient.cpp line 629
0x402046ff: MqttClient::reconnect() at C:\Users\HW\AppData\Local\Temp\builda1c577501961b4e0365618c3762dbe2f.tmp\sketch/MqttClient.cpp line 581
0x4020bcb1: Print::println(int, int) at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266/Print.cpp line 174
0x402047a1: MqttClient::loop() at C:\Users\HW\AppData\Local\Temp\builda1c577501961b4e0365618c3762dbe2f.tmp\sketch/MqttClient.cpp line 550
0x40201d52: delay at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266/core_esp8266_wiring.c line 53
0x40205461: loop at C:\Users\HW\Documents\Arduino\thingsConnect_v5/Wifi.ino line 39
0x4020a700: loop_wrapper at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266/core_esp8266_main.cpp line 43
0x40100958: cont_norm at C:\Users\HW\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.1.0\cores\esp8266/cont.S line 109

[HW-Siew]

Newest version library seems to fix this already. Thank you so mcuh.