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Error invalid json

PostPosted: Thu Aug 08, 2019 7:21 pm
by emprenet
Hello, my table was working perfect until a few weeks ago, the following error message appears: Invalid json sent back from server. Error: TypeError: Cannot read property '0' of null Server sent:

And that's it. Sometimes I can enter perfectly, I go out and when I re-enter to work the message reappears.
I haven't touched a line of code for months, that's why it misses me.

Any ideas?