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I received a WhatsApp forward that reads:

If you touch the๐Ÿ‘‡black point then your whatsapp will hang

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Surprisingly on touching the black dot, it crashes WhatsApp (The whole screen hangs and we have to wait till WhatsApp closes). Is there any reason for this crashing behaviour? (Attaching screenshots for reference)

Causes the crash

The crash

This crashed on my Android (8.1) Phone. My friend who uses an iPhone claims that it doesn't crash on his phone. (I hope this is the right place to post the question)

1
  • Same message is also causing hang/crash in Signal messenger
    – Abdul Rauf
    May 4, 2018 at 16:53

4 Answers 4

9

As others said, there are ~2000 zero-width or 'invisible' unicode characters in that message. These characters are the ones which instruct the text renderer whether to display the text left-to-right or right-to-left. When you tap on the message, the text renderer tries to work out which character you are tapping on. As there are a lot of characters with conflicting instructions, the app hangs up until it can make a decision.
There is this very elegant and informative video by Tom Scott on youtube that explains the problem better than I ever can: https://youtu.be/jC4NNUYIIdM

2

that message have more than 2000 no displayable characters and for be that long message make a crash if you hit wait on the message it came back to normal just give it time to process the long long long string

1

The message have a lot of (about 2000) invisible characters called "left-to-right makr" (It is used to set the way adjacent characters are grouped with respect to text direction)

0

It just bunch of letters and numbers hidden behind that ball and bugged so someone who touches it, it will try to open the whole message but cant hence as a result it crashes the app..

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