I searched but didn't see anyone else reporting this. Thanks in advance for any feedback!
We recently discovered numerous persistent PHP warnings in our server error log file:
[22-Jan-2019 12:34:05 America/Denver] PHP Warning - A non-numeric value encountered - file: /simplepress/sp-api/sp-api-class-spcpost.php - line: 580 - function: saveData
[22-Jan-2019 12:34:05 America/Denver] PHP Warning - A non-numeric value encountered - file: /simplepress/sp-api/sp-api-class-spccache.php - line: 41 - function: add
Not sure exactly how long it's been going on, and don't necessarily notice any impact, other than exponential growth of the error.log files. Notice only seems to periodically appear in the SP Admin -> Toolbox -> Error Log but seems to be constantly written to the server error logs.