Hi I was trying to save the matrix field and got the error: "Internal Server Error
Undefined index: handle"
I checked out all fields' handles and they are all in place.
Is there any reason causing the error?
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This ended up being an environmental issue with semi-largish Matrix fields.
The three most common culprits are your php.ini file's max_input_vars, max_input_nesting_level and post_max_size would would need to be adjusted upwards, but other settings might come into play depending on your environment an Matrix configuration.