Multiple web clients cause crash

[mcspr]

I´ve tried 1.13.5 with a Son Off pow r2. It was working for more than a day, and I made log in from another browser (I had a browser in one computer opened and monitoring it every few hours) and then I opened the second one in another computer and made login again, the Sonoff was rebooted.

I paste the information from the crash command.

[038911] [DEBUG] Latest crash was at 179498184 ms after boot
[038915] [DEBUG] Reason of restart: 2
[038918] [DEBUG] Exception cause: 29
[038921] [DEBUG] epc1=0x4020e0de epc2=0x00000000 epc3=0x00000000
[038925] [DEBUG] excvaddr=0x00000000 depc=0x00000000
[038928] [DEBUG] sp=0x3ffffd20 end=0x3fffffb0
[038931] [DEBUG] >>>stack>>>
[DEBUG] 3ffffd20: 3fff872c 3fffa808 3fff07b4 4020ccd9
[DEBUG] 3ffffd30: 00000aac 00000aac 00000aac 00000000
[DEBUG] 3ffffd40: 00000014 3fff710c 3fff07b4 40215d8d
[DEBUG] 3ffffd50: 00000000 00000000 00000000 3fff624c
[DEBUG] 3ffffd60: 00000014 3fff624c 3fff6f98 40215e1b
[DEBUG] 3ffffd70: 3ffe9468 00000000 3fffaa34 00002000
[DEBUG] 3ffffd80: 3fff7146 00000014 0000000a 0000000f
[DEBUG] 3ffffd90: 00000059 00000050 3ffffdd0 00000000
[DEBUG] 3ffffda0: 3fff710c 00000001 3fff07b4 40217b83
[DEBUG] 3ffffdb0: 3fff3714 00000910 00000910 4010020c
[DEBUG] 3ffffdc0: 00000001 3fff710c 3ffffe10 4010068c
[DEBUG] 3ffffdd0: 3ffea6f0 50590f0a 3ffffe10 4022cb94
[DEBUG] 3ffffde0: 3fff2274 00000a2f 00000a2f 4010020c
[DEBUG] 3ffffdf0: 00000001 00000000 3ffffe40 3fff7bf4
[DEBUG] 3ffffe00: 00000001 3fff710c 00000000 4022d47a
[DEBUG] 3ffffe10: 3fff72e4 3ffe85e4 40221648 4022df4d
[DEBUG] 3ffffe20: 00000000 31343033 3fff710c 4021fd4d
[DEBUG] 3ffffe30: 3fff2274 00000000 3fff710c 40220636
[DEBUG] 3ffffe40: 3fff710c 3ffe85e4 4021faa0 4022119c
[DEBUG] 3ffffe50: 3fff755c 000000d8 3fff731c 401004d8
[DEBUG] 3ffffe60: 3fff2274 00000906 00000906 3fff2860
[DEBUG] 3ffffe70: 00000104 000000d8 3fff731c 4022066d
[DEBUG] 3ffffe80: 3fff7bf4 caa5a253 00002200 401075b0
[DEBUG] 3ffffe90: 3fff7294 3fff286c 3fff7bf4 4022dfac
[DEBUG] 3ffffea0: 3fff7bf4 00000104 3fff755c 402217a5
[DEBUG] 3ffffeb0: 00000001 3fff2a58 3fff755c 4021a228
[DEBUG] 3ffffec0: 3fff7744 3fff2868 3fff2864 4021a248
[DEBUG] 3ffffed0: 3fff7744 3fff2868 3fff2864 40243505
[DEBUG] 3ffffee0: 00000000 9e590f0a 00000010 00000000
[DEBUG] 3ffffef0: 00000010 00000000 3fff1154 401075a0
[DEBUG] 3fffff00: 40230000 00000000 00000064 3fff2a50
[DEBUG] 3fffff10: 3ffebe5a 3fff2a58 3fff6cc4 40241a55
[DEBUG] 3fffff20: 3fff27bc 3fff650c 3fff650c 3ffeff60
[DEBUG] 3fffff30: 00000000 3fff6cc4 0000001c 3fff650c
[DEBUG] 3fffff40: 3ffebe4c 00000000 3fff6cc4 40240e4d
[DEBUG] 3fffff50: 50590f0a 0000005e 00000000 00000044
[DEBUG] 3fffff60: 00000002 0000001a 4023063b 3ffee978
[DEBUG] 3fffff70: 3ffebe24 3fffdcc0 3ffeaff8 3ffeaff8
[DEBUG] 3fffff80: 402305ae 3ffee978 00000000 3fff657c
[DEBUG] 3fffff90: 3fffdc80 00000000 3fff6cc4 40238acb
[DEBUG] 3fffffa0: 40000f49 3fffdab0 3fffdab0 40000f49
[DEBUG] <<<stack<<<
[039652] +OK

Originally posted by @Interpyme in #1617 (comment)

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