Infrequent crashes

[dagwieers]

In DEMO made running overnight, I experienced one crash.

Serial communication... OK
Initializing LED... OK
Initializing scheduler... OK
Initializing barometer sensor... OK
Initializing humidity sensor... OK
Initializing particulate sensor... OK

=> Please connect to SSID: ADEM-9087009
=> And surf to: http://192.168.4.1/


Exception (29):
epc1=0x4000e1c3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000018 depc=0x00000000

ctx: sys
sp: 3ffffc80 end: 3fffffb0 offset: 01a0

>>>stack>>>
3ffffe20:  401030a9 3ffef580 3ffeff80 00000000
3ffffe30:  40219ca9 40219be6 3fff3c7c 40103238
3ffffe40:  00000018 3ffeff80 3ffefefc 00000000
3ffffe50:  40219d40 3ff20a00 3fff3c7c 3ffed0be
3ffffe60:  3ffed0a4 3ffec3d8 3ffec3d8 3ffed0a4
3ffffe70:  3ffed0be 0000002c 00000004 401004f4
3ffffe80:  3ffed0ae 3fff403c 40216a93 3ff20a00
3ffffe90:  3fff3c7c 3fff97e4 00000015 40216965
3ffffea0:  3ffec3fc 4010760c 3fffc258 4000050c
3ffffeb0:  40000f83 00000030 00000010 ffffffff
3ffffec0:  40000f3d 00000023 00000000 3fffd9d0
3ffffed0:  00000000 00000000 00000000 fffffffe
3ffffee0:  ffffffff 3fffc6fc 00000000 3fffdab0
3ffffef0:  00000000 3fffdad0 3fff2344 00000030
3fffff00:  3ffed700 00000000 00000036 401004d8
3fffff10:  4021df01 ffffffd6 00000000 40107a98
3fffff20:  40216201 3ffed0a4 3ffef580 3fff3c7c
3fffff30:  00000000 3ffed0ae 3ffed0c8 40106e56
3fffff40:  40211660 00000000 3ffed0ae 3ffed0a4
3fffff50:  0000002e 00000000 3fff403c 3ffed098
3fffff60:  00000000 00000036 40211292 3ffef580
3fffff70:  3ffed098 3fffdcc0 3ffebbc0 3fff3f24
3fffff80:  3ffed0b4 00000040 00000000 3fff2350
3fffff90:  40210bdf 3fffdab0 00000000 4020e877
3fffffa0:  3ffebbc0 40000f49 3fffdab0 40000f49
<<<stack<<<